The SACM is right next to the downstairs PC, however the upstairs one requires the internet.
So your suggesting wiring the SACM to the router... and then wirelessly connecting the two computers to the router using PCi-Bluetooth cards
The upstairs pc I imagine will be fine with a pci 802.11b card, since she only uses it for msn/yahoo and chat rooms

however mine is used for gaming alot, so would I need the higher spec one? since my pc is a athlon64 gaming system? if so would the router be able to handle two different speed pci cards?