Assigning F keys to tasks?

Heres my situation: I just picked up an Apple keyboard to run with my pc (I’m stuck here until the new macbooks come out) because I love they way they type and I needed a new keyboard. Is there a way to assign the F keys to different things that would function in programs where those keys weren’t assigned to specific functions. Particularly, I want my F10, F11, & F12 to work as they would on a mac (mute, volume down & volume up respectively)

Anyone know how to do this or know of a program that would allow such tasks?

Oh, and, while I’m asking – any way to make Command function as CTRL? I’ve been using macs so much lately that its now habit to hit Command-C or Command-V, etc. instead of CTRL.

Thanks!