KneeTheCap: I changed my mouse back to the older one, and the crashes seem to have vanished. What the hell?
I only saw this thread now but after reading your original post my initial thought was going to be the mouse. I've found anytime a pc starts bluescreening I look to any hardware that was changed recently followed by what software got installed/reinstalled/uninstalled before the bluescreens started happening.
Most of the time bluescreens don't start happening out of the blue if a machine hasn't had any changes made to it. Its usually a hardware or software change or even a driver update that causes them to happen.
Most likely its a driver issue with the new mouse that your pc doesn't like. You can go look for a updated driver online and try that. If thats not an option, I'd continue to use the old mouse and think myself lucky I don't have to reimage my pc or worse, buy a new one.