Cant get to internet, cant reboot .

I have no encountered this particular problem but i found a web page that does, go to the link and see if it will help you repair this.
http://superuser.com/questions/56998/how-solve-lsass-exe-application-error-on-windows-xp-on-start-up

Microsoft, Windows, Vista Home Premium, blank desktop, mesh, Ideal, personal computer ... Disabled all non ms-services and all startups via msconfig; ..... RunOnce: [*Restore] C:\Windows\system32\rstrui.exe /RUNONCE .... says "Windows Resource Protection could not perform the requested operation." ...
www.experts-exchange.com/.../Microsoft.../Windows/Windows_Vista/Q_23053429.html

Isass.exe is a system process that is required to run windows, I suggest you re-install your Operating System (Windows XP)

Well then... you should restart your machine and press F8 (on your keyboard) continuously until prompted with a menu.

Select the option "last known good configuration"... that should bring your machine back to how it was before IE screwed it up.

Hope this helps!?

isass.exe is registered as the Optix.Pro virus which carries in it's payload, the ability to disable firewalls and local security protections, and a backdoor capability

How Do You Remove Isass.exe Files in Windows XP and Vista:

1. Click your Windows Start menu, and from “Search,” click “For Files and Folders….”
2. A speech bubble will pop up asking you, “What do you want to search for?” Click “All files and folders.”
3. Type a Isass.exe file in the search box, and select “Local Hard Drives.”
4. Click “Search.” Once the file is found, delete it.

How to stop Isass.exe processes:

1. Click the Start menu, select Run.
2. Type taskmgr.exe into the the Run command box, and click “OK.” You can also launch the Task Manager by pressing keys ALT + CTRL + DELETE or CTRL + Shift + ESC.
3. Click Processes tab, and find Isass.exe processes.
4. Once you’ve found the Isass.exe processes, right-click them and select “End Process” to kill Isass.exe.

How to remove Isass.exe registry keys: (Do not delete anything other than what is listed below.)

1. Select your Windows menu “Start,” and click “Run.” An “Open” field will appear. Type “regedit” and click “OK” to open up your Registry Editor.
2. Registry Editor will open as a window with two panes. The left side Registry Editor’s window lets you select various registry keys, and the right side displays the registry values of the registry key you select.
3. To find a registry key, such as any Isass.exe registry keys, select “Edit,” then select “Find,” and in the search bar type any of Isass.exe’s registry keys.
4. As soon as Isass.exe registry key appears, you can delete the Isass.exe registry key by right-clicking it and selecting “Modify,” then clicking “Delete.”

How to delete Isass.exe DLL files:

1. First locate Isass.exe DLL files you want to delete. Open your Windows Start menu, then click “Run.” Type “cmd” in Run, and click “OK.”
2. To change your current directory, type “cd” in the command box, press your “Space” key, and enter the full directory where the Isass.exe DLL file is located. If you’re not sure if the Isass.exe DLL file is located in a particular directory, enter “dir” in the command box to display a directory’s contents. To go one directory back, enter “cd ..” in the command box and press “Enter.”
3. When you’ve located the Isass.exe DLL file you want to remove, type “regsvr32 /u SampleDLLName.dll” (e.g., “regsvr32 /u jl27script.dll”) and press your “Enter” key.

That’s it. If you want to restore any Isass.exe DLL file you removed, type “regsvr32 DLLJustDeleted.dll” (e.g., “regsvr32 jl27script.dll”) into your command box, and press your “Enter” key.
Did Isass.exe change your homepage?

1. Click Windows Start menu > Control Panel > Internet Options.
2. Under Home Page, select the General > Use Default.
3. Type in the URL you want as your home page (e.g., “http://www.homepage.com”).
4. Select Apply > OK.
5. You’ll want to open a fresh web page and make sure that your new default home page pops up.

Block Isass.exe sites: www.eKerberos.com
Stop Isass.exe processes:
Get rid of Isass.exe DLLs: %PROGRAM_FILES%\ eKerberos\ Hook.dll
Delete Isass.exe folders: %PROGRAM_FILES%\ eKerberos\

Please rate this a fixya

you got virus, and Trojan on your laptop.
need to go buy a good antivirus software. i.e. symantec, McAfee, etc..........
ask the sales person in the store.
scan the laptop.

Does the dialog box say Isass.exe not found !!! If so then it was corrupted by a virus and ur antivirus did a bad job of cleaning it... it modified/deleted it. Isass.exe is a system/servicecontrol file. If u have another pc copy Isass.exe from it..... Isass.exe is found in C:\Windows\System32

y cuse its sharing isssas to 1st off way to maby boots 2 max os on hard drive unless u want to fail soon do all your updates

If you have (L)lsass.exe, that is a windows executable file, if you have Isass orisass.exe, then you have a trojan, run your antispyware and antivirus programme using safe mode (press F8 on boot up) to enter safe mode. Also you must turn off system restore before you run the virus removal, then turn it back on again.