Re: Big problems, need advice
It's a pretty easy upgrade, I think that would do a lot of good. Based on your processor speed I'd say you have either integrated graphics or an AGP port if there's one for a graphics card. If you can check to see if you have integrated graphics, pop open the PC and look for an AGP slot. If there's not one that looks different than all the regular PCI slots than you're probably out of luck. But I had a Dimension with a 2.0GHz pentium and a GeForce4, when I upgraded to a FX5200 I saw a huge difference (even though it's still not that good of a card). A bunch of people here will recommend ATI AGP cards, I'm not too much of an expert on those so just do some shopping or wait for other opinions.
As far as the upgrade itself goes, it's very simple. My first computer work ever, all you do is pull one card out, put the other in, and change your drivers.
For the spyware, I use AVG free edition that comes with a free spyware scanner, you might want to give that a try.