Hmm I know the problem. Apparantly the game tries to read all of my 2.5Gb of maps on a new reinstall. So bug is that game has no good way to check up maps on update or reinstall.
Alright, once again: rename your maps folder, create a new maps folder and move your maps in 250-500 MB steps. Then start spring (spring.exe), wait until you see the menu and quit again (shift+esc). Repeat until you moved all of your maps. The same goes for mods.
