My friend has just bought a new computer that came with Windows XP HOME addition already installed. Somebody else took the computer and installed simply accounting on it. I'm not sure what happened after that, but now when you reboot the computer and the login screen comes up I get this error. "A problem is preventing Windows from accurately checking the license for this computer. Error #0x80090006. I can no longer log into the machine any longer. It keeps popping this message up. I can however login in using safe mode which I don't quite understand why. Any ideas?