red alert 3 on windows 7

hi

i got red alert 3 and tiberium wars 3 and also the first edition of the first decade wth the games till generals now the decade disc i can install and play but red alert 3 and tiberium wars 3 i can't even install from the discs now i see you can buy the games set up for windows 7 but wondering if there is a solution so i don't have to buy games i allready bought