Back up game files on my desktop how do I get them back in the game?

My system mechanic warned me to make a back up of my files because there was a hardware problem. I was also instructed to contact windows help which I stupidly did. The 'expert' had me do a custom reinstall. I was supposed to have a file called windows.old but its not there and of all the stupid stuff that could have backed up successfully it was my sims game. But it wouldn't restore so I had to move each zipped file onto my desk top. When I extracted them they make a new open file on my desk top. How do I get them from my desk top back to the game. I had to reinstall the game itself after this fiasco.

Any help would be greatly appreciated. I've already spent 2 days on this and am deep into day three.