I just found some file called invokesi.exe on my public files.
Is it a virus…?
Why don’t you submit it to www.virustotal.com and post back? 
Date first seen: 2009-10-29 08:16:56 (UTC)
Date last seen: 2011-05-22 05:25:25 (UTC)
Detection ratio: 0/43
That was about invokesi.exe
Now dcmsvcsetup.exe
Date first seen: 2009-10-29 08:16:08 (UTC)
Date last seen: 2011-05-29 08:45:37 (UTC)
Detection ratio: 0/43
So no viruses… Strange files :s
BTW. Is Eraser removing tool safe to use?