Hi
Win XP was the last windows on a CD
Vista onwards are on DVD
Run the windows upgrade assistant as it is
Probably best to check suitability for windows upgrade or clean install before starting as you may find old programs or hardware which are not supported by win 10
Eg old printers ,scanners, tv tuner cards or specialist software etc
To upgrade run setup on win 10 dvd from windows 7
You will/ should get an option to clean install or upgrade
I forgot to say you cant upgrade from 32 bit W 7 to 64 bit Win 10 version
How much RAM do you have in your PC?
Regards
Mike Barnes