Previously, I actually wanted to buy a Win7 Home Premium OS CD so that I could reformat and reinstall both my pcs.
But then after getting replies and guidance through this thread that I do need to be aware of which licence keys both my pcs is activated right now etc2.
For example, Volume Licence keys could not be reused again etc2. Drivers to be downloaded etc2. I myself isn't really sure the keys that I saw from MJB is the VLK which could not be reactivated or the individual licence keys.
I didn't know that formatting PC and reinstalling Windows are so confusing.
I guess that I'm just going to perform recovery for both my computers as per your guides so I won't have to worry about the licence keys and drivers.
Thanks a lot phillpower2 for your detailed explanation. I do greatly appreciate it.