Well I hate trying to revive dead threads but I have an issue. I got the fallout series and it plays fine. I then decided to get the F2RP mod for fallout 2. Now the game wont run saying it's running in compatibility mode even though it's not. I read through this thread and tried all the different fixes that applied but to no avail. Maybe it's because I'm doing this all on a windows 8 laptop. If you guys have an answer I would be forever grateful.
Just in case anyone else runs into this problem and gets frustrated, here's the solution.
Before you install the Fallout 2 Restoration Project, backup the ddraw.dll file in the Fallout 2 directory. After you've installed the F2RP mod, copy the ddraw.dll backup file back over the new ddraw.dll file.