I had Installed Avast antivirus free in my laptop windows 7, which i want to delete from my laptop. I tried to uninstall it from Programs where it is not available. it's folder is present in c:/program files. I tried to delete it from there but it shows message as 'You need to provide administrator permission to delete this folder' What can I do? Please help... I have installed new antivirus McAfee for three years today... please help