how do i re-install games after getting a new os

mcle

Honorable
Feb 6, 2014
421
0
10,790
hi all, i just got my computer back from a repair shop and they installed a new windows 7 as my old version wasn't entirely legal. they also backed up my old hdds to a new hdd. now i want to re-install my games but seeing as i already have all the folders i need, i don't want to waste space by making new downloads, can i re-install my games like bf4, war thunder, verdun and sniper elite 3 through the folders? and if so how?
thanks
 
Solution
If they are in a different directory you can just leave them. They dont HAVE to be deleted, but they will be wasting space if you re install.