How do I revert a Windows update?

My son has an MSI Laptop running Windows 8.1. Following a recent Windows update (he cannot be more specific) he is no longer able to use his Admin (the only one) account. He sees the mouse pointer but the rest of the screen is black. Ctrl-Alt-Del does bring up a panel offering the usual options to shut down, reboot, Task Manager, etc. - but when I select Task Manager with the intention of seeing what processes are running, the dialogue does appear, but before it is properly displayed it vanishes. Meanwhile the HDD light is burning constantly. If I simply leave the machine for 30 minutes or so, then the HDD activity subsides but there is still a blank screen. Moving the mouse pointer to the top or bottom right hand side of the screen has no effect.
Unfortunately we did not have the wits to set restore points
Interestingly the other account (not administrator) is working without problem.
any guidance would be much appreciated.

Neil

Hello Neil,
You might want to use this method to assign Admin right for the working account or to turn on the built in Admin account:
http://www.eightforums.com/user-acc...nt-win-8-1-update-how-restore.html#post389686
Once logged in with Admin right, create another account, assign Admin right to it, move all personal data to the new account then delete the corrupted account.

Hope this helps !!!

You can go to Control Panel - Programs - Uninstall a Program, then click on "View installed updates" on the left. You can sort the view by date installed to help zero in on the problem update.

Recovering an Admin account in Windows 8.1

mikeytg said:

You can go to Control Panel - Programs - Uninstall a Program, then click on "View installed updates" on the left. You can sort the view by date installed to help zero in on the problem update.

Click to expand...

I deleted the most recent software installations but unfortunately it has not resolved the problem - but many thanks for the suggestion.
regards.
neil

topgundcp said:

Hello Neil,
You might want to use this method to assign Admin right for the working account or to turn on the built in Admin account:
http://www.eightforums.com/user-acc...nt-win-8-1-update-how-restore.html#post389686
Once logged in with Admin right, create another account, assign Admin right to it, move all personal data to the new account then delete the corrupted account.

Hope this helps !!!

Click to expand...

I'm going to try this tomorrow - I'm brain dead right now
Thanks.

Neil