Another iTunes Query...
 

Kinda hate iTunes.

Anyways, I'm looking to be able to use both my own Apple ID (and library) and my girlfriend's off of the same PC. I believe you can set up separate libraries so that our stuff doesn't cross over on to each other's devices so I've done that, I've also created her a separate user account on the PC, however, the problem occurs when I try to play/download anything from her library from the cloud. I'm told that the PC is linked to another ID (mine) and playing/downloading any of her purchased music will stop me from doing the same from my account for 90 days.

Is there actually a way to run 2 separate Apple IDs/libraries from one PC without losing any functionality?

Nope. It's one iTunes Match account per computer. Purchases can be authorised on up to 5, but using things in the cloud is 1 account per PC.