You are more than welcome,
To put it lightly.. yes.
the standard is 512MB-1GB.. with the release of vista, it may even become 2GB in the next few months. if you are careful about buying the same type (eg: pc133, or pc333 etc - it should say on the side of your ram stick) it is simply a case of upgrade rather than replace
... and i'm always glad to hear people checking for spyware regularly... most of the computers i fix are damaged because of such issues, good for me, but it does get repetitive.