Go into Start / Run type "msconfig" and to startup and close all non-essential programs on the startup (just temporarily you can always put them back) and restart your computer, if it still gives the error it has got to be a system file, and you can email Mr. Bill Gates(Microsoft Tech Support, www.microsoft.com) / Self-Imposed God and ask them.
I wouldnt recommend doing this though if you do not know what you are doing or what the essential startups are and what the non-essentials are.
By the way, yes, this does belong in the Help Forum.
Let me know how it turns out mate.

Maybe tonight we'll fly so far away... We'll be lost before the dawn...