Need help for Virus scan

Hello all,
I have a strange virus problem (of window randomly maximizing and minimizing). I tried to get a solution @ this forum earlier, somebody suggested its may be KeyBoard problem. But not. Its still in my machine (Win XP sp3).. I have Kaspersky paid version, didnt found the virus. Now I have Avast free version, not found any virus on my machine. Still I think there is one hiding on the machine. I need somebody in bangalore who can help me in scanning my HDD with their Antivirus. I can take my HDD to them and check it. Please let me know .
Note: the basic but annoying problem is Windows (active one) keep minimized and maximized randomly. Looks like somebody shaking my monitor
sometimes everything works fine...If you ask me to name this virus,, I would say "Earthquake virus" which happen for few moments and at unpredictable time. If I press f12 or cntrl sometimes it stops. But as soon as I release it, then again......again.....
This problem is more some times,, I guess the program is making some random check on it and starts. Cant see anything in taskmanager unusual.

I too think it is keyboard problem.to confirm i suggest you format your windows the problem would still not resolve. The problem must with alt and tab buttons.

Earlier when I disconnected the KB, then it stopped. But nowadays, even I disconnect the KB, it keep on "shaking" :-)

Use "Hijack This" and check anything abnormal. And use "Task Kill" to get rid of the task.

will try that also...