There a a few games that just won't run on Windows 7. I have only come across a few. However most have a compatibility work round, either from
Microsoft where you search for a specific game genre and title. Known work arounds will be presented to you.
Failing that you should find help at the games web site. EG. for Doom II it would be Id software. Here I have drilled down a bit for you.
Doom II page.