Help, my display on my laptop rotated 90 degree on its own.?

I suppose it is a virus but Mcafee, stinger, and adaware have not located it. Running Windows XP

Answer:
Reinstall window and use the repair option. Check display properties. Or try a different virus scanner. Sounds resembling a trojan horse though.
Ghost in the contraption?
Go to settings, display
boot in safe and sound mode hit F5 repeatedly while booting..
check your display properties, advanced settings and look for rotation...

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