I tried to look around if someone else has had this problem, but I didn't spot anything. I just downloaded Overseer and installed it succesfully on Vista. However, when I try to play the game, it asks me to insert disc 1 and won't let me continue. I can go to configurations, but that's it.
I'm not very good with computers, so I hope someone will be able to help me. Thanks in advance!

Someone had a similar problem with disc 2 in UAKM, perhaps it could help you with your problem.
Check this thread:
http://www.gog.com/en/forum/tex_murphy_series/problem_with_uakm_amp_quot_insert_disc_2_amp_quot
If its the same problem all you would need to do is go to the menu config and reassign the drives for the game.

Thanks for the reply. Fortunately I managed to solve the problem myself, but you're all going to laugh at me when I tell you what was wrong. Turns out I wasn't even having a problem with the game, or at least the version I purchased here. I was trying to run the DVD version of the game that I bought and tried to install about half a year ago. Man, oh, man.