I'm unable to install Quick heal antivirus
due to the presence of silly worm on my computer
First while starting quick heal installation just after extraction process keep pressing Ctrl + Shift key this will skip the memory test and allow you to proceed with quickheal installation. Then it will detect "silly worm" in c:\documents and settings\user\csrss.exe and will do a native boot scan and remove csrss.exe files adn you can proceed.
Thanks to Mkm
for this tip.