Question : Winlogon process

I seem many instances of Winlogon process running on my system at the same time. I though that gets executed only when I log on to the system. And that should be once. But I see many processes going on. Is it something unusual?

Answer : Winlogon process

Research it, get Process Explorer. http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx It provides more information than Task Manager.
Normally you dont see more than one instance of Winlogon. You should also do a scan for virus. malware and rootkits as a norm to see if ther might be something else going on.