It's probably due to a lack of drivers. Windows can't find proper drivers for all the different types of hardware available. If your computer came from a retailer like Dell, HP, or gateway, etc...they should have also given you a cd with drivers on it.
If your pc was built by you, or you have lost the afore mentioned cd we can always find them online.
You can always check your device manager (right click My Computer > Properties > Hardware (tab) > Device Manager) to see which, if any devices need new drivers. They will be labeled with a yellow exclamation mark beside them.
Oh, wait. What I did is reinstalled with my E-machines restore disk, and all I got was errors. At startup it wouldn't even load, and if it did, it said I was missing C:/windows/system32/system or something like that. I am reinstalling agian.
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