What is your definition of "old"?

Games like Fallout 2 and Theme Hospital?

I've been able to play a lot of older games on Vista by running Setup with 256 color mode/640 X 480 resolution checked (right-click Setup icon), not selecting any particular Windows in the compatibility section. Then you install.

Nope, I tired it and got the garbled graphics during the installation... 😖

good old games are selling fallout 2 and they say its xp + vista compatible
http://www.gog.com/en/intro

Try downloading the application compatibility toolkit and forcing directdraw emulation? For Fallout at least,, don't know if Theme Hospital uses directdraw.

How do I do that? I tried using the programs and it just keeps saying it can't load the fonts....

Another good option you should try is running the game in "administrator mode". That actually solves the problems for many older games in Vista. Right-click the game shortcut and choose "run in administrator mode". After that you can customize the shortcut itself and enable the administrator mode on every run by enabling that option in the compatibility tab.

I've found that to fix problems for many older games on Vista, as for example, Sanitarium. Running the game normally would produce illegal operation error on startup and the game would not boot at all. After enabling the administrator mode, on the other hand, the game started up normally and worked like a charm. Give it a try.

I kept getting the "can't find fonts" error, so I tried to uninstall it but I got an error... And now I can't unisntall it properly?
I wonder if I can just delete the files so I can install it again?

Whatever I did with the application compatibility toolkit messed it up apparently...