From what I remember a single svchost.exe process instance could be handing multiple "services" - you could see the mapping of service to PID in the Services, and there wasn't a 1:1 relationship.
So did you actually know what services were running based on the processes to support the belief that "there were no other processes acting in the background"?
So did you actually know what services were running based on the processes to support the belief that "there were no other processes acting in the background"?