There's no relation at all between registering your OS and having an original licensed CD. It isn't illegal at all to not register your OS, but it's clearly illegal to run it without a valid and paid for license. So, although, I admit you do have a problem, it's not that the OS isn't registered.
The only thing I can advise at the moment: do a clean install of any OS you like (Windows or Linux spring to mind). If you don't have a licensed Windows CD: buy one for the version you prefer.
Hope this helps.
I have an unregistered Windows 2K operating system from a friend a few years ago and yesterday I got the bloodhound.w32.ep virus. I could connect to the internet for a very short time and then got booted. I could not update my Norton anti-virus software or go to websites like adaware, avg, etc...So, I went to the store to buy new anti-virus software. Norton would only run on XP which I don't have so I bought Kaspersky per the store's recommendation. It seemed to install fine but once I went to register, the computer shut down and restarted with the Blue Screen of Death. It now continues to do this. I get the stop:c000026C unable to load device drive and the error status 0xc000012F. Also says \??\c:\winnt\system32:12x32.sys cannot be loaded. I cannot boot into safe mode per the screens directions.
What should I do?
Do I need to install XP from scratch? I don't have a Win2000 CD since it was an unregistered copy.