Blink problem Sir, i am using Compaq Presario C700 Model No. C770 TU since last 10 months. Now whenever i open any drive (C, D, E) whole screen blink so speedily that i can't work . I asked to some knowledgeable people for this problem, they said it may be virus problem, but i have installed avast 4.2 antivirus and update it daily. My lapi has no virus at all. Please give a appropriate solution for this problem and why it is happening.

To solve this problem as fast as possible. try having a Clean install of your windows.  After installing your windows, if it still manifest the same problem, you might have a problem with your hardware. it might be the video controller?
You can also try downloading the newest video driver for your notebook.  It might still be a virus, that Avast cannot detect. because most antivirus have problems detecting the virus especially if you have installed the anti-virus after you had a infection..