I'm sure this has nothing to do with SHIV install unless you are running a crack version.
Try resetting a restore point made before your mouse problem, then test the mouse. This may result in you having to reinstall the game. There is also the possibility your touchpad has failed, but unlikely. If a restore point doesn't get you back, you might have a corrupted user profile. Create a new profile and test your mouse, if that ends up boing the solution, there is a document on the MS web site on how to move your old profile into the new ones without moving the corrupted files.
You can also plug in a USB mouse to test with.
Last but not least, install a commercial (not freeware) spyware detection/removal program.
-Pv-
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