Key
couple of option here to close the crashed app,
1) use ALT-TAB to go the failed error, cycle holding the TAB key while tapping ALT ket to get to error, when is highted release the TAB and with Mouse click the X to close it
2) ALT-CTRL-DEL to go to Task manager
just select CoD then right cick app then select end task
Key you need to run compatibility mode by go in settings system
open that and direct to C:\Program Files (x86)\Activision\Call of Duty - World at War/ CoDWaWmp.exe run it from there .
issue is the game was made in 32Bit and FAT32, your new OS is 64 bit also NTFS format.
me i used old drive in new system to get game to play or you can use third party