Dear Bala,

Two suggestions: run a free bootable anti-virus check and run tweaking.com's free windows repair.

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Your anti-virus was complaining and your problem is widespread, so it's worth running another anti-virus, preferably on a bootable CD or USB--get a second opinion that your system isn't infected.

Avira offers an .exe version of its .iso file that will automatically burn the .iso to a bootable CD for you:

http://www.avira.com/en/download/product/avira-rescue-system

If you know how to burn .iso images or make bootable USB sticks, here are some other free bootable anti-virus programs:

http://www.avg.com/us-en/avg-rescue-cd-download
http://research.pandasecurity.com/panda-safecd-4-4-3-0
http://download.bitdefender.com/rescue_cd/v2/
ftp://rescuedisk.kaspersky-labs.com/rescuedisk/

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When Windows 7, Vista, or XP systems mysteriously refuse to install or update for my clients, I routinely reach for this program:

http://www.tweaking.com/content/page/windows_repair_all_in_one.html

Install it and run it as administrator. It fixes lots of problems with ownership, rights, attributes, and registration.

Cheers,

Carl Fogel