For one System Mechanic 7 is not an anti-virus program. It cannot be used to replace one. It can also cause problems on some PCs.
As for an update causing that error the only one I can think of is an Office update and it needs the Office CD to compete the update.
This error also comes up on some HP computers.
What is the make amd model of your computer? What other anti-malware programs do you have? Do you have Office installed and if so what version? How long did you go with updates turned off?
Your computer may be infected. To check follow the directions in the links below.
Read this: Preparation Guide For Use Before Posting A Hijackthis Log, Instructions for receiving help in cleaning your computer
Then post a Hijack This log at this section of the forums: HijackThis Logs and Analysis
Edited by TheTerrorist_75, 17 February 2007 - 08:44 PM.