|If you use a Live Knoppix CD (or DVD) then it will run from just your CD (or DVD) drive and the RAM. It also allows you to access the HD, even though it is not using it. You can therefore get your own files off the HD and onto a flash drive. When a computer runs Knoppix but not Windows it more or less proves that you either have a Windows software issue (provided that you can access the HD).|
In Windows "System" (on its own as given) is the registry, which is why this looks like a registry issue. There are various magic registry fixers around but they will not help because all they do is remove invalid entries, which don't usually matter much anyhow.
I've not run into a way of re-installing Windows using Knoppix - sounds a bit hard to believe to me because it would have to get its new Windows files from somewhere to be able to do that.
I'm afraid you either need a Windows disk or a restore disk.
Always pop back and let us know the outcome - thanks