Game locks up during loading

[Meehael]

I had my brother to try the game on his and dad's computer. The game worked fine on his machine with winxp sp3, but on dad's win7 the game didn't work (even in compatibility mode). My brother's machine has vanilla sp3. That is, he doesn't have automatic updates turned on, and he didn't install any windows updates or hotfixes after he installed the sp3. I, on the other hand, have sp3 with hundreds of additional windows updates and hotfixes.

I tried to uninstall every version of .net framework, and then install the basic v1.1, but it didn't help. I don't feel like uninstalling sp3 to check that out, though.