I purchased the GOTY edition and had no problem with it on my old Vista PC. Once I got a new computer with Windows 7, I had all sorts of issues installing it. However, it finally installed, and I've run the game successfully (I've had to do it in windows mode, not full screen, but that's stopped the crashes occurring). However, while I've installed the second disk (by running setup manually), none of the GOTY expansions show up when I play the game - no quests, no nothing.
Has anyone else had this issue, and if so, have you found a solution?