I have the same problem as you, but my Win 7 is 32 bits instead of 64. My Windows also crashed with a blue screen and the mouse (Thinkpad Bluetooth Laser Mouse) refused to work afterward. What I did is that when I tried pairing, instead of clicking on to the device right away (you will end up waiting indefinitely if you do so, I'm afraid), I right clicked on the device and chose Properties- not Add The Device. A small window will open with heading like "Bluetooth services" beow it will be a line that says "Drivers for keyboard and mice, etc" just tick the box and press OK or apply, the device will pair right-away. In my case, it took quite a while to obtain the driver from Microsoft...so I skipped the waiting (there's an option to skip the wait) . Right after I skipped it, the driver is installed and the mouse functioned perfectly.
I hope that I could help in some way. Good luck !