computer hangs

I have a Dell Dimenstions 4800 P4 2.4 gig PC. I am runniung XP home w/ SP2. I have had this machine for a little over a year now. The problem that I am having is this: The computer seems to hang every now and then. Usually this will happen when I am not using it after it turns on the screen saver. But every now and then it will happen when the PC is in use.

I had this same exact problem with the PC that I replaced with this one. That machine was a P2 350 running xp home w/o SP2. The first thing that I thought that it could be was my belkin USB hub that I had with the old machine, because everytime it hung up the lights on the hub would all be out. So I disconnected the hub and ran everything directly into the dell except for my flash card reader and my Axim PC link cable. After a week the without the hub the problem would still happen. So I started disconnecting hardware from the usb ports that I had when I had the old machine. This included just an external HD and a printer.

I have noticed that it happens a lot less now with out the external HD attached, but it still happens every now and then. I don'w know if this is a hardware or a software conflict so I will post this in both forums.

Any help would be greatly appreciated.

Thanks

 

Did you install any programs, anything at all that would have also been installed on your previous system?

Did you transfer any hardware, RAM, Hard drive, etc?

 

I didn't transfer any hardware or OS. the only software that was the same was adobe photoshop 6.0.