Thanks guys for your replies. I guess I'm just being overly cautious about being hacked, since I do have a static ip, and leave my connection on for most of the day. I always run zonealarm's firewall program and just recently bought a router that has some firewall capabilities -mainly to connect my xbox to the internet. Main reason I even asked this question was I think I remember being able to turn off the sharing of the hard drive under win95 or win98.
Also, I don't see any difference with the operation of the computer when I do turn off the sharing off, so just thought might as well have it turned off for good. But, with the router and software firewall, I guess I shouldn't worry too much. Anyways, thanks again for the great info guys.