Please try the exe file which runs without the Windows "manifest" files.
- locate your ootp9.exe, it should be in the OOTP 9 program folder C:\program files\Out Of The Park Developments\OOTP Baseball 9\
- rename the file to ootp9.exe.save
- locate the file ootp9.exe.manifest which should be in the same folder
- rename the file to ootp9.exe.manifest.save
- download this file:
http://www.ootpdevfiles.com/ootp/ootp9_pre_XP.zip
- open the zip file and copy the ootp9.exe file into the OOTP 9 program folder