Downloaded and installed trial version of NOD32 antivirus today. Quite a number of viruses and trojans were detected. Removed them but after a while I noticed that the same viruses were reappearing in the Threat Alerts. NOD32 is installed on a HP dv6110us laptop. Many of the viruses were in D:\MiniNT\system32, system, and C:WINDOWS\system32, system folders. Having keyboard and mouse execution problems with the laptop. This condition worsens as the viruses reappear. Have to hit mouse several times before deletion of viruses. Why do the viruses reappear?