screen is fliped

Best thing is to update your anti-virus program and perform a virus scan to look for viruses. Also, use Ad-Aware to find and delete the spyware files on your systsm.

Ad-Aware is available for download from,

http://www.lavasoftusa.com/software/adaware

This should do.

By flipped, i take it you mean turned 90 degrees?
since you have a lab, I would suspect one of your students is pulling a funny on you and has written a script to do this. You might find a xxxx.vbs somewhere or they may be doing it from a floppy.
Just a thought

on nVidia cards you can do the trick using just the Detonator drivers. As your Dells have the Intel graphics this must be sth different... but from the DOS-times I remember a simple .bat that I used to spring on my friends. Most likely someone's playing pranks on you - check for .vbs and .bat (or maybe .scp or .hta as well).

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