Specifically Stalker mods. I try an entire conversion of a game, and spend hours making edits to make it work with my game, because it's so poorly made, yet the idea is good, and then I try to merge it with some other mods after I fix them and spend a few more hours doing that. Alright, everything seems to be working. I get to the end of the game. Right before I get to see the ending I never saw, my game won't finish because there's a bug with the entrance to the end room, and I can't get in. And there's no more entrances. Reinstall. Then I proceed to get another conversion, and then remerge, edit, etc for hours. Game starts up fine, and I get going in the game. I hit quick-save. My game crashes. Start it back up. Since the quick-save didn't work, I have to start over. Then I try quick save after about ten minutes. Crash again.
I still need to reinstall.