I have a black screen after I have entered my windows password. I can see a the mouse moving around but no desktop

Restart your computer repeatedly tapping the f8 key to enter safe mode while the screen is black once in safe mode where the only things working will be your keyboard and mouse allowing you to attempt to repair your computer

If done properly the user should get to a screen similar to the below screen.

Select the option for Safe mode command prompt only

Windows Advanced Options Menu
Please select an option:

Safe Mode
Safe Mode with Networking
Safe Mode with Command Prompt

Enable Boot Logging
Enable VGA mode
Last Known Good Configuration (your most recent settings that worked)
Directory Services Restore Mode (Windows domain controllers only)
Debugging Mode

Start Windows Normally
Reboot
Return to OS Choices Menu

Use the up and down arrow keys to move the highlight to your choice.

select safe mode with command prompt then type in chkdsk/f/r which will scan for and and attempt repair of bad files and bad sectors on hard drive

you should have no input while chkdsk utility is in progress any input might further damage your computer or

Use the System File Checker tool (SFC.exe) to determine which file is causing the issue and then replace the file.

Type the following command and then press ENTER: sfc /scannow The sfc /scannow command scans all protected system files and replaces incorrect versions with correct Microsoft versions.

now for the password

restart your computer repeatedly tapping the f8 key to enter safe mode while the screen is black once in safe mode where the only things working will be your keyboard and mouse allowing you to attempt to repair your computer

Windows Advanced Options Menu

Please select an option:

Safe Mode
Safe Mode with Networking
Safe Mode with Command Prompt

Enable Boot Logging
Enable VGA mode
Last Known Good Configuration (your most recent settings that worked)
Directory Services Restore Mode (Windows domain controllers only)
Debugging Mode

Start Windows Normally
Reboot
Return to OS Choices Menu

Use the up and down arrow keys to move the highlight to your choice

select safe mode with command prompt

Click start run type cmd press Enter

black screen should open DOS mode

this will vary depending on your operating system

type in net user username

For eg. If you want to change administrator password , type net user Administrator

it will prompt you to enter the new password

enter the new password and the password is changed

if this fails you will need to

Select safe mode with networking to download

you could download all of these or just one save them to a usb drive for later use if one fails to remove the password

http://majorgeeks.com/CmosPwd_d239.html

A CMOS BIOS password recovery tool

Editors note: This tool should only be used by experienced computer users. Please see the enclosed read me if you would like to run it from Windows. Failure to follow instructions (from Windows) will cause your anti-virus to flag this as a virus.

http://www.afreecodec.com/windows/top-windows-software/windows-password-recovery-software-49067.html

Data Doctor Password unmask unhide program is a useful free utility to reveal passwords hidden behind the asterisk ***** characters inside any protected password text box

http://majorgeeks.com/Dr._Freeware_System_Utilities_d6416.html Dr.Freeware System Utilities which includes data recovery software, data backup, password reset tools for Windows helps you to maintain your system. Dr.Freeware is freeware, you can download and use it for free.

hope this helps