Windows 7 black screen with cursor

HP ZBook Laptop after windows updates boots to black screen, no start menu or task bar.

I ran appwiz.cpl from task manager and removed all the recent updates, still same. Also tried CCLeaner registry fix.

Anybody got any ideas that don't involve re-installing windows? Apart from missing interface I can run any program from Task Manager.
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jawa29IT Section ManagerCommented:
Can you run explorer.exe? this is the main interface exe. If you try running this it should restore the start menu etc...

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Restore to the last restore point and you should be good to go if the problem was created by installation of patches or software.
HKFueyAuthor Commented:
Most other things run, but not explorer.exe
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jawa29IT Section ManagerCommented:
Is it already running in the task list? If so kill all instances and try running it again.

If not then F8 on power up to access the repair options to see if you have a restore point as pointed out by paarun.
Ok, this is a known problem. Mostly, the cause are drive letters being mixed up. I know, you didn't change those, but it happens sometimes (very rarely) on its own.
Please use task manager to open regedit. Then navigate to HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices and delete that very branch "mounteddevices" and reboot. See if it solves the problem.

[no, this is not dangerous - that key gets re-created on next startup]
HKFueyAuthor Commented:
Hi McKnife
Tried that screen still black.

Also tried a system restore.

Also tried msconfig and removed all startup services apart from the windows ones.

Now looking for restore point, not hopeful.
HKFueyAuthor Commented:
Sorry, meant Startup repair
And what if you start explorer.exe from task manager, does that work?
HKFueyAuthor Commented:
Re "start explorer.exe from task manager" nothing happens

System restore turned off, no restore points : (
Another go: use taskmgr to start userinit.exe
HKFueyAuthor Commented:
Worth a go, but I just get a brief hourglass
please open cmd and see if the drive letters are still correct. Launch
cd %windir%
Where does it go, it would have to go to c:\windows
HKFueyAuthor Commented:
cd %windir% does go to C:\Windows
Ok. The only time I saw that very problem and it was NOT the disk letters being wrong, was a virus infection. Do an offline scan.
imo this issue often happens after a  wrongly updated driver - usually video driver
try booting in safe mode with internet - and update the chipset and video driver
or uninstall the video driver -reboot - and reinstall the video driver
Have you tried booting from a CD/DVD and running a repair?
HKFueyAuthor Commented:
Hi Everyone, thanks for the help. This same laptop started going flaky a few months ago and I still have the original disk. Going to clone it repair it and see what happens.

AND make sure Windows Backup is enabled.
cool, keep us posted.
HKFueyAuthor Commented:
Did the repair, ended up in the same place. One virus found on offline scan.

I should have bitten the bullet and done a fresh install, would have been quicker : )

The comments were the best effort. To rate it average is a little... well :)
HKFueyAuthor Commented:
Thanks for the help.
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