HKLM\SYSTEM\CurrentControlSet\Enum I am trying to instal HP 7780 All in one but I get error no registry key and:HKLM\SYSTEM\CurrentControlSet\Enum Does any one had such a problem?

uninstall the existing printer drivers first before you try a reinstall.

I found this on superuser link at the bottom.
No third party software required. Tested with K9 Web Protection version 4.4.268 on Windows Vista SP2 (32-bit). Confirmed by @stiemannkj1 to be working on Windows 7. Should also work on Windows 8.x.

1. Create a new text file. Copy and paste the following batch script code, then save:@echo off set keys=^ "HKLM\SOFTWARE\Blue Coat Systems"^ "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\k9filter.exe"^ "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Blue Coat K9 Web Protection"^ "HKLM\SYSTEM\CurrentControlSet\Services\bckd"^ "HKLM\SYSTEM\CurrentControlSet\Services\bckwfs" REM remove registry keys for %%G in (%keys%) do reg delete "%%~G" /f >nul set folders=^ "%programfiles%\Blue Coat K9 Web Protection"^ "%programdata%\Microsoft\Windows\Start Menu\Programs\Blue Coat K9 Web Protection" REM remove folders for %%G in (%folders%) do rd /s /q "%%~G" set files=^ "%windir%\System32\drivers\bckd.sys" REM remove files for %%G in (%files%) do del "%%~G" pause exit /b
2. Make sure file extensions are shown and rename it to RemoveK9.cmd (or whatever you like, as long as it has the .cmd extension).
3. Restart Windows in Safe Mode.
4. Right-click the .cmd file and select Run as administrator from the context menu. Wait for the batch script to finish.
5. Start regedit.exe and navigate to the following registry key:
   <code>HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_BCKD Right-click the LEGACY_BCKD key and select Permissions from the context menu. Click Advanced and select the Owner tab. Then select Administrators from the owner list, tick the Replace owner on subcontainers and objects option, and then click OK. Then select Everyone and tick the Allow checkbox for the Full Control permission. Click OK, right-click the key and finally choose Delete.
   
   
6. Restart Windows.

How can uninstall K9 Web Protection without K9 admin password

solution 1>
CAUSE:
Certain HP services (and associated DLL files) were somehow partially/improperly installed. (Possibly, from a previous failed install?)
The Windows services (files) were:
Pml Driver HPZ12 (C:\Windows\System32\HPZipm12.dll)
Net Driver HPZ12 (C:\Windows\System32\HPZinw12.dll)
The existence of these 2 files in the System32 directory was causing this error in my situation. Somehow, the installation script was not identifying that these files were already installed (or improperly installed) and failing to properly set them to be installed again.
SOLUTION:
Steps:
1) Check to make sure that the 2 Windows services above are not running (or not installed).
2) Rename/delete the 2 associated service DLL files (this will only be possible once the services are stopped)
3) Run the installation again.

.......................................................................
solution 2>

complete uninstall printer software from computer.
run uninstall L1 L2 L3 L4(if not an hp computer).
run same uninstall l1l2l3l4 from 7z..folder or hp folder from temp if availalbe.
then clean from add remove programs/program and features.
then clean from cleanup utility all hp pritner related entries.
then clean temp folder. clean recycle bin.
delete c:\program files\hp and hewlett packard folders (if not an hp computer). on hp computer delete digital imaging bin folders.
delete following folders from following locations-
C:\windows\System32\Spool\Printers and deleted entries inside it
C:\windows\System32\Spool\drivers\w32x86\*.* deleted entries inside it
C:\windows\twain_32.

cleanup from regsitry--
plz make back up for registry first.
>> hklm/system/current control set/control/print/environment/windowsNT(x86/64)/drivers + processors delete all pritner entries from there.
>> hklm/system/current control set/enum/usb/vid_000,vid_003 delete.
>> hklm/system/current control set/enum/usbprint delete pritner entries.
>> hklm/system/current control set/control/print/monitors/hp standard tcp/ip ports/ports.
>> hklm/system/current control set/control/print/monitors/standard tcp/ip ports/ports.
>> delete same ports from printers and faxes/pritners pritner properties ports
>> hklm/system/current control set/control/print/monitors/hpz..
>> hklm/system/current control set/control/print/providers/lan man settings.
>> hklm/SYSTEM/CURRENTCONTROLSET/CONTROL/PRINt/PRINTERS
>> hkey_Current_User\Software\Hewlett-Packard
>> hKey_Local_Machine\Software\Hewlett-Packard
>> HKEY_USERS\.DEFAULT\Software\Hewlett-Packard
>> hkey_current_user\software\hewlett packard delete if not hp computer.
>> hkey_curent_configuration/system/current control set/control/print/pritners.
then go to msconfig
make it selective startup disable all microsoft services except hp services. hide all microsoft services. disable all startup tab apply restart.
after restart install cue version 12 officejet pro 8500 or 6500.
then run msiexec.exe /unregister then msiexec.exe /regserver cmd commands.
then install software from downloaded version of original pritner install only basic drivers first and imaging devices only and use solution center 12. cue 12.
issue resolved.

you can try with installing the windows installer 4.5 and then try.. otherwise reinstalling windows might work because the error you are getting is related to installer.. and its a service of windows itself which is responsible for all the software installation..

This is an internal installation error. There can be 2 solutions:---- Solution 1:-- Find all of the hpqwrg files and delete them before installing the software:

1. Click Start .
2. Click Search ( Find for Windows 98).
3. Click Files and Folders .
4. In the Named entry box, type hpqwrg .
5. Set the Look In entry box to C: .
6. Click Search Now ( Find Now for Windows 98).
7. Click Edit , and scroll to Select All .
8. Delete all files pertaining to hpqwrg . There will be approximately five to six files.
9. Be sure to empty the recycle bin of these files also.Solution 2:---- Completely uninstall the higher version of software and reinstall the lower version first, follow the steps below in order:
   1. Uninstall all of the HP Photo and Imaging software (for both of the products). (The uninstall program can be found in theControl Panel in Add/Remove Programs ).
   2. Re-install the lower version of the software.
   3. Re-install the higher version of the software. Thank you Sir.

CAUSE:
Certain HP services (and associated DLL files) were somehow partially/improperly installed. (Possibly, from a previous failed install?)
The Windows services (files) were:
Pml Driver HPZ12 (C:\Windows\System32\HPZipm12.dll)
Net Driver HPZ12 (C:\Windows\System32\HPZinw12.dll)
The existence of these 2 files in the System32 directory was causing this error in my situation. Somehow, the installation script was not identifying that these files were already installed (or improperly installed) and failing to properly set them to be installed again.
SOLUTION:
Steps:
1) Check to make sure that the 2 Windows services above are not running (or not installed).
2) Rename/delete the 2 associated service DLL files (this will only be possible once the services are stopped)
3) Run the installation again.

.......................................................................
solution 2>

complete uninstall printer software from computer.
run uninstall L1 L2 L3 L4(if not an hp computer).
run same uninstall l1l2l3l4 from 7z..folder or hp folder from temp if availalbe.
then clean from add remove programs/program and features.
then clean from cleanup utility all hp pritner related entries.
then clean temp folder. clean recycle bin.
delete c:\program files\hp and hewlett packard folders (if not an hp computer). on hp computer delete digital imaging bin folders.
delete following folders from following locations-
C:\windows\System32\Spool\Printers and deleted entries inside it
C:\windows\System32\Spool\drivers\w32x86\*.* deleted entries inside it
C:\windows\twain_32.

cleanup from regsitry--
plz make back up for registry first.
>> hklm/system/current control set/control/print/environment/windowsNT(x86/64)/drivers + processors delete all pritner entries from there.
>> hklm/system/current control set/enum/usb/vid_000,vid_003 delete.
>> hklm/system/current control set/enum/usbprint delete pritner entries.
>> hklm/system/current control set/control/print/monitors/hp standard tcp/ip ports/ports.
>> hklm/system/current control set/control/print/monitors/standard tcp/ip ports/ports.
>> delete same ports from printers and faxes/pritners pritner properties ports
>> hklm/system/current control set/control/print/monitors/hpz..
>> hklm/system/current control set/control/print/providers/lan man settings.
>> hklm/SYSTEM/CURRENTCONTROLSET/CONTROL/PRINt/PRINTERS
>> hkey_Current_User\Software\Hewlett-Packard
>> hKey_Local_Machine\Software\Hewlett-Packard
>> HKEY_USERS\.DEFAULT\Software\Hewlett-Packard
>> hkey_current_user\software\hewlett packard delete if not hp computer.
>> hkey_curent_configuration/system/current control set/control/print/pritners.
then go to msconfig
make it selective startup disable all microsoft services except hp services. hide all microsoft services. disable all startup tab apply restart.
after restart install cue version 12 officejet pro 8500 or 6500.
then run msiexec.exe /unregister then msiexec.exe /regserver cmd commands.
then install software from downloaded version of original pritner install only basic drivers first and imaging devices only and use solution center 12. cue 12.
issue resolved.

This issue requires some serious trouble shooting and solutions cannot be posted as they are too long.
If you want further support you can avail free technical support on http://tinyurl.com/m7ghqz

Solution 1



Right click on setup file and select run as administrator


Solution 2

• open registry editor, start -> run -> type in: regedit
• Open Hkey_local_machine folder
• Open System folder
• Open Currentcontrolset
• Right click with mouse on enum
• Select Permissions
• make sure user: SYSTEM has FULL CONTROL permission
• See picture:

Make sure system has Check On Allow Full control and read.

Check all users listed that there are no checks on deny.



You can also press ADD to add your own user, then click advanced, then click find now , select your user, click ok, click ok, give your

user full control and read permission.



Apply and ok. double check that there are no Deny permissions set.



let me know the results and do not rate solution untill we have solved the problem.



Thanks,

Ekse

First, try running the installation as Administrator. Right click on the executable and select Run as Administrator. If that doesn't work, go to that registry entry and make sure that System and Administrators have Full Permissions.