After you unlock don't close the game, shift+f4 or alt tab, then go into data/misc folder and backup f1,2,3.xyz files. Those ones contain all unlock information for your game on that system. It's not necessary to backup whole game for this one reason.
The other thing that came to mind is to check how your power options are set up (in control panel). You might want to play with some options there. Switching from balanced to high performance solved at least one type of BSOD for me.
You card is several generation behind the current one so be careful when installing new drivers. Make sure they work for your card. And never install beta drivers unless you know exactly what you're doing.
Perhaps googling "bsod win2k.sys" can give you more directions how to deal with the issue. Certainly more than I could
Anyways I highly doubt LFS causes it because it's very cleanly coded in terms of crashes by now.