I've been getting a lot of memory parity errors lately (about two days ago I got three in a row) but there doesn't seem to be anything wrong with my RAM. I took them all out and checked them, they were clean and there wasn't any visible damage. I stuck them in my brother's computer and they ran just fine.

So is there anything else that can cause a memory parity error? What could I do about it?

For refrence, I'm running an old P4 with 1.5 gigs o' RAM (+1/2 of gig video RAM). It's pretty old, which might be the problem right there, but I'm not sure how to "fix" old other than buying a new computer (Which I can't afford.).