When I upgraded to Ubuntu 12.04, I had a bit of an error--the OS no longer recognizes my Microsoft Wireless Laser Mouse 5000 completely. I'm currently using the gnome shell, and when I try to open the Activities window by hitting the top left corner, nothing happens. I cannot interact with anything with the exception of a couple of items on a page.

I'm almost certain that this is a driver issue, seeing that I can unplug that mouse and use my mousepad instead (I'm on a laptop). Only problem is, I have no idea how to write a driver. :/

Any help would be most welcome.