mouse mapping - HELP!!

I have my mouse set up to allow me to scope (alt fire) using a click on the mouse wheel, it is still used to scroll between weapons.

I bought a new mouse (M$ wireless laser 5000) yesterday, installed all the software, and it worked fine for a while but last night I found that the middle mouse button can not be mapped so i am left in-game with no way of scoping in when sniping!

I went back to my ps2 ball mouse and the same problem is still occured.

HELP

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