Hello, I was using F-Secure Anti-Virus Client Security V.6.02.12250 and I decided to switch to NOD32 Antivirus System V.2.70.32, so I uninstalled F-Secure and then I installed NOD32. Unfortunately, when I rebooted the system there was no NOD32 icon in the icon tray and the Windows Security Center informed me that my system is protected by more than one anti-virus systems. Then I thought that something didn't go well with the unistallation of F-Secure so I re-installed it and uninstalled it again! Nothing happened, no change, there were more than one anti-virus systems in the WSC again and no icon of the NOD32 at the icon tray. Finally, I re-installed NOD32 and guess what... NOTHING!!! What am I supposed to do to fix this, formatting the disk is not a solution for me. Any ideas? Thanks in advance, D.