Cheat Engine

[BanditWulf]

personally a emachine is not the best to go with but you should upgrade it and get more RAM you should buy the stick with 2gz each and buy 2 i know they cost like 60 - 90 each but its worth it

[Cheetah]

The amount of RAM you have will significantly affect performance, especially when you have that little. 512MB is the bare minimum these days. When you fill up all your physical RAM, the computer has to start using virtual memory, which is using part of the hard drive as fake RAM, but this is really slow. To put it into perspective, RAM these days will typically have a throughput of around 3-12GB/s, and a hard drive will move around 40-120MB/s, not to mention a hard drive has about 100x poorer latency, so needless to say you want to avoid using virtual memory at all costs.

As far as RAM speeds, fast RAM is really just a gimmick. I use my computer for some pretty intense things, and going from DDR333 to DDR1066 on the exact same hardware otherwise, there was no noticeable bump in performance. Tomshardware, did benchmarks and concluded that on modern processors, RAM speed has virtually no effect on performance for most tasks. Just make sure you get the proper type of RAM, DDR2 RAM will not fit in a DDR3 slot, even though they are both 240-pin slots.

[Mobsy]

Who were the 2 bright minds who voted 'no' in the poll? I mean, RAM affecting CPU speed is a pretty basic fact, but if you really don't know that, then please take voting in polls out of your mind, pick up a copy of 'ICT for Dummies' and read.
Anyway, back on topic, yes, RAM does affect CPU speed. And with that tiny ammount that you have, it wouldn't surprise me if everything you run goes slow. I would suggest and upgrade to at least 2 gigs, but taking in count that you're hosting a private server, you definitely want 8 gigs, or at least as high as you can go (no less than 4 gigs if you expect a half decent ammount of people to connect to your server).
Hope it helps.