You can find most of the information listed in "System Information" in the section of the registry following:
Browse through the sub-folders and you'll see some of the information. I would advise you not to edit any of that information though. Other bits of information listed in "System Information" are scattered throughout the registry and some might just have been generated through calculation ( such as used space and available space ).
It's always nice to have some feed back after things are fixed =)