You don't mention which OS. However, assuming it is one of Mr Gates' fine(?) products, are you installing on a 'bare-bones' system ?
I.e. CPU, Motherboard, CD drive, hard drive, memory only.
You can get some serious nasties/funnies otherwise.
Try with the basics then once you have a stable & updated system add the extras as it were.
Apologies if I am telling Grandma how to suck eggs.