0x80004005

i installed windows xp on an older computer i couldn't find the cd key from my last computer to install it so i got one off the internet, i tried to activate it but it won't let me, it keeps on saying error code: 0x80004005. it won't even let me log on can some one help me?

you must use the key that's on the your windowsxp-cdrom. If you take one from the internet, it is possible somebody else took the key before you did...