I had the same problem u did, couldn't switch weapons, give squad orders, etc!, so I went out and bought the cheapest wheel mouse I could find (Kensington #19420, $9.99), and plugged it in. Now everything works ok, but I can't move or shoot worth a ****!. I have been using a Logitech #T-BC-21 Marble Mouse for about 3 years now. Just for giggles, I plugged my Logitech back in also, and was pleasantly surprised to be able to use both mouses without any conflict in or out of the game. I use the Logitech for everything but weapons changes, and squad orders. Hope this helps somebody else out there!
Intel P4 3.2 HT
NVidia GeForce 7800 GS OC 8x AGP 256MB DDR3
4GB OCZ Ultra High Performance 3200/400MHZ RAM
ANTEC Smart Power 2.0 500watt PS
Logitech T-BC21 Marble Mouse
Kensington 19420 Wheel Mouse