Upgrade or Build a new system

It depends on how much money that you have. If you have the money and time to replace all those components of your computer, I would definitely say go for replacing the mobo.

Is it relatively easy to remove the CPU from its socket or should I have some1 else help me?

I would say that your CPU is fine. Dell will skimp on the hard drive though, so you might want to get a fast SATA drive and controller if you don't have any SATA ports on your mobo. Also your graphics could be updated with something like a nvidia 6800GT for AGP. You've already got 1GB RAM which is good.

I wouldn't try to replace the mobo in that system. If you are going to do that, build from scratch with a new case and everything. A standard board might not even fit in that Dell case.

That is a good point...it did not occur to me though since I don't have a Dell.

for the love of god, build your PC

I have a Dell e510, and it is probably the worst PC i have ever owned when it comes to stability, compatibility, and upgradability (new word?)

I could have built a PC for $100 less, and it would have been more powerful, reliable, and upgradable.

i second that vote. anything you build is better than whatever Dell can offer you -- price wise, performance wise, stability, take your criteria Dell will lose.

the trouble is some people are really afraid of doing this. it has to do with the warranty for some people, i think. individual components have warranties on them, so you should feel confident with that. if you buy from a reputable vendor you can return faulty parts, if you get any (i thought i have faulty RAM one time, but I just had to use different DIMM slots -- then it was fine).

at work we have a contract with Dell (I absolutely hate this fact) and I was asked to price out 3 new comps, for myself, my boss and someone else. it ended up being like $1300 each and it was very basic really -- 820 CPU, 1GB DDR2-533, 160GB, 17" lcd, radeon x300 (default). it's just insane, i could build an AMD system for around $900 that would be as good or better.

BUILD YOUR OWN COMPUTER
DELL SUCKS

Its annoying to take the proc out of dell pcs. I did it myself. As for HDDs, they usually are good, mine from my dell computer is a fast sata disk and its working very well.