I have Problems with my games Please help

Hi All ,
I am having trouble with the games on my computer. I lost the setting and other configuration of the games when I installed Windows 7 64-bit Service Pack 1. I called some of the games developer and they told me that I just have to delete some sort of file in the games installation folder.
Do I need to do it on all the games or is there something that I need to install on my computer to make it work?Please help
Thank you
