I currently have a Dell Dimensions 4550C desktop. It has a Pentium 4 2.4GHz (if I recall correctly) and has served us quite well. Recently we have noticed that the computer seems to be slower and bogging down when running multiple applications. I have already minimized startup applications and keep ontop of viruses/spywear/adwear.
Basically I want to upgrade our ram. We currently only have 256 DIMM DDR PC2100, with one free slot. What would you guys suggest, keeping in mind that my specs stated that I have a max capacity of 1Gig RAM, and would like to minimize cost as much as possible. Oh yeah I am in Canada too

Thanks so much.