PCguard Anti-Virus didnt detect a virus, but I used another virus scanner and it found one. How can this happen?
Different Anti-Virus packages operate in different ways, and viruses may be identified differently from product to product. Some Anti-Virus software may detect and classify spyware programs as viruses. Also, you should always update your Anti-Virus software before you perform a scan, to ensure it has the most up to date information about the viruses in circulation.