Glad to hear it's running smoother... nothing worse than a slow PC!

We used Microsoft security essentials here at work.. it's pretty good, low footprint, works well, and it's free!

a program called ccleaner (crap cleaner) is pretty good too, use that from time to time. Otherwise, make sure you have good hard drive space avail, or it will be slow. The ram should just work once plugged in.. so I guess you havn't got the right clock speed or somethin? It's a minefield these PC parts..