Over the past week my Windows desktop at work started acting up. When opening or right clicking any file that has a program associated to it I would experience up to a 30 second delay before the program launched or the right click menu opened. I scoured Google for an answer and all I found were others with the same problem. One person found that when they disabled their network card it would work fine. I tried that and had the same result. Checking the network properties I noticed that Virtual Machine Network Services was active on my network card.
This must be remains from a Virtual PC or VMWare install by the previous user. After un-checking the box everything is back to normal.