Page 1 of Need Help!

I need help with my PC and thought you guys might be able to help.
I have just installed 128Meg of memory, however I now seem to having some trouble with the sound.
It will play sound in games and off the CD no probs, it seems to be just Windows` own sounds ie. Maximize, Minimize, start-up, shut-down etc.
All I get is a "machine gun" style interference.
I know these are not very technical terms but it`s the only way I can describe it!
Any help you could give would be great.

check to see if your sound card is still installed (control panel, system )
if not reinstall it, failing that did you unseat the sound card when you installed the memory