Have you ever encountered a computer that is so badly infected by spyware and virus that the computer is so slow and you could hardly do anything on it? Fully booting in to computer takes like 15 minutes, then to install an on-demand antivirus program takes another 30 minutes and then to update the signatures takes another hour. Running a full scan would definitely take more than an hour. The computer should be cleaned from virus IF the on-demand antivirus is able to detect and remove   read more »