I wrote down the CD key I had on a .txt file in a hard drive that's not on the operating system.
I installed with dummy key, assuming I will be able to put my previous working key in after installation.
I tried activating it with previously valid key. It does not accept it. It is the same computer, same machine.
The only difference is that I've installed Windows XP again, I am unable to access some files from my previous User Name in Documents and Settings due to access denied, even though I know the password, but that's not the main issue.
Anyone know any way to fix this? I have in my possession a valid key that I used on this machine to download the new internet explorer and receive regular updates from microsoft.