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There is some kind of malware installed on a client's computer. It effectively prevents the administrator account from being used.

It pops up a fullscreen window which you can't get around: Alt+Tab does show the list of windows, but switching doesn't work. You can start the task manager, but it loses focus. However, ordinary user accounts seem not to be affected. I tried to find out the malicous process using processexplorer while simultaneously logged into another user account--but couldn't find any suspicous processes.

Is it possible to find out which process has opended that window while logged into another user account? The drag&drop inspector, which comes with processexplorer of course doesn't work, because you can't move the mouse to another session :-)

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If you are unable to make the task manager the focused application it will be tough. My suggestion, backup the files, and format the computer. You can also create a new admin user... – Ramhound May 7 '12 at 16:02
@Ramhound Thanks Ramhound. I reinstalled windows. Can't believe how windows sucks. – artistoex May 9 '12 at 16:19

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