slowing down every 3 seconds

http://www.neuber.com/taskmanager/process/vsmon.exe.html

"vsmon.exe" belongs to ZoneAlarm personal firewall, which monitors Internet traffic and generates alerts by following the security rules that users configure in Zone Alarm.

Get more detailed information about vsmon.exe and all other running background processes with Security Task Manager.

Note: Any malware can be named anything - so you should check where the files of the running processes are located on your disk. If a "non-Microsoft" .exe file is located in the C:\Windows or C:\Windows\System32 folder, then there is a high risk for a virus, spyware, trojan or worm infection! Check it out!