Repairing W7 Pro x64 Product Key ?

I have my orginal O/S disk that does not have SP1 on it. Can I use another O/S W7Pro x64 disk with SP1 to perform the repair operation. Then will it require me to enter the new product key or can I keep the same orginal product key? Does the program read the product key from the disk?.

I guess my other choice is to uninstalll SP1 & run the repair program from the orginal disk..

You can use the disc with SP1 on it. The key is not on the disc, your key should be okay.

Win7 Professinoal x64 English Official ISO Download
Windows 7 USB-DVD Download Tool

Use your own key to reactivate after Repair Install.