Brian
easy enough to do, but expensive if you get it wrong.
1st. Discover what type of memory your PC already has
2nd. Buy some more of the same
3rd. remove main power cord from rear of box.
4th. remove side panel
5th. find memory on motherboard.
6th. either add or exchange memory chips. (don't force the retaining clips).
7th. replace power cord.
8th. Boot PC
9th. If all well, replace side panel
Good luck
Mike
Mike MacSorley, March 2008