How to manually remove programs from the Add or Remove Programs tool

  1. open Regedit.exe
  2. go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
  3. Each key listed under Uninstall in the left pane of Registry Editor represents a program that is displayed in the Currently installed programslist of the Add or Remove Programs tool. To determine which program that each key represents, click the key, and then view the following values in the details pane on the right:
    DisplayName: The value data for the DisplayName key is the name that is listed in Add or Remove Programs.
    -and-
    UninstallString: The value data for the UninstallString key is the program that is used to uninstall the program.
    Delete each key you want to remove from the list.

 

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How to restore the system/boot drive letter in Windows

  1. Make a full system backup of the computer and system state.
  2. Log on as an Administrator.
  3. Start Regedt32.exe.
  4. Go to the following registry key:
    HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices
  5. Click MountedDevices.
  6. On the Security menu, click Permissions.
  7. Verify that Administrators have full control. Change this back when you are finished with these steps.
  8. Quit Regedt32.exe, and then start Regedit.exe.
  9. Locate the following registry key:
    HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices
  10. Find the drive letter you want to change to (new). Look for “\DosDevices\C:”.
  11. Right-click \DosDevices\C:, and then click Rename.

    Note You must use Regedit instead of Regedt32 to rename this registry key.

  12. Rename it to an unused drive letter “\DosDevices\Z:”.

    This frees up drive letter C.

  13. Find the drive letter you want changed. Look for “\DosDevices\D:”.
  14. Right-click \DosDevices\D:, and then click Rename.
  15. Rename it to the appropriate (new) drive letter “\DosDevices\C:”.
  16. Click the value for \DosDevices\Z:, click Rename, and then name it back to “\DosDevices\D:”.
  17. Quit Regedit, and then start Regedt32.
  18. Change the permissions back to the previous setting for Administrators (this should probably be Read Only).
  19. Restart the computer

 

http://support.microsoft.com/kb/223188

How to run Control Panel tools by typing a command

http://support.microsoft.com/kb/192806

Control panel tool             Command
   -----------------------------------------------------------------
   Accessibility Options          control access.cpl
   Add New Hardware               control sysdm.cpl add new hardware
   Add/Remove Programs            control appwiz.cpl
   Date/Time Properties           control timedate.cpl
   Display Properties             control desk.cpl
   FindFast                       control findfast.cpl
   Fonts Folder                   control fonts
   Internet Properties            control inetcpl.cpl
   Joystick Properties            control joy.cpl
   Keyboard Properties            control main.cpl keyboard
   Microsoft Exchange             control mlcfg32.cpl
      (or Windows Messaging)
   Microsoft Mail Post Office     control wgpocpl.cpl
   Modem Properties               control modem.cpl
   Mouse Properties               control main.cpl
   Multimedia Properties          control mmsys.cpl
   Network Properties             control netcpl.cpl
                                  NOTE: In Windows NT 4.0, Network
                                  properties is Ncpa.cpl, not Netcpl.cpl
   Password Properties            control password.cpl
   PC Card                        control main.cpl pc card (PCMCIA)
   Power Management (Windows 95)  control main.cpl power
   Power Management (Windows 98)  control powercfg.cpl
   Printers Folder                control printers
   Regional Settings              control intl.cpl
   Scanners and Cameras           control sticpl.cpl
   Sound Properties               control mmsys.cpl sounds
   System Properties              control sysdm.cpl