Freezing problem..cant figure it out

[GGtW]

About 2 weeks ago I was having some issue's with my 2nd rig, it would blue screen about every 2 hours or so, I'd reboot then it would reconize my hard drive, I'd wait 5-10 minutes, reboot and it would reconize it. I cant open up my C drive fine, it's only partioned into 1 piece.
It's stopped doing that, but not every 2 minutes or so my computer freezes/locks up all applications for only a couple seconds (1-3). I can move my mouse cursor, but cant do anything else.
I thought it might be the hard drive, so I ran disk defrag, didnt help any. Took the ram out, remounted it, reconnected the hard drive etc..Nothing seemed to work.
Just past couple hours during game play it will start to get all kinds of graphically black blockage...not sure how to describe it but it's happened about 5-6 times so far today.
Specs:
AMD Athlon 64 3000+
Gigabyte GA-K8NSC-939 Motherboard
2 Gig OCZ Ram
Nvidia Geforce 5500
Drive
180 GB Maxtor 6Y200P0
Windows XP

Can't seem to figure this one out, any help would be nice, thanks in advance.

 

[grizzed]

Have you noticed that if the system has been off for awhile and then started the sytem run ok for a while before the errors start to occur and then occur more frequently the longer the sytem is running? If that's the case it suggest a probable hardware issue.

 

[GGtW]

Not sure, I ussually keep this system up and running for long periods of times, minus a reboot every day or so.
I just moved 3,000 miles and it was in the back of a trailer so I worried if something did get damaged some how.

 

[grizzed]

reseating the ram was a good idea if it was in a trailer, you might want to go back in and reseat all the connectings even that ones that looks good. With all the movement the hard drives are a good place to look. defrag was a start, but you might want to get some utilities to take a closer look at the hard drives. I know western digital and maxtor have utilities that will verify the state of a hard drive.

I've seen hardware issues get progressively worse at the hardware heats up. So video cards problems get worse the longer the system is running. Maybe run utilities to check the temps fo some cards or try the system after it has been shut down for 30-60 minutes.