I have a user running Windows XP Home Edition. Every time he tries to logon, I get an error message as follow:

Windows Product Activation

An error occurrred while the wizard was checking the current Window product license. Error Code: 0x80040507

I googled the error code and tried a few things, such as deleting temporary internet files, ran adaware & spybot with no help. Scanned for viruses (clean). Tried repairing the XP installation (no help). Ran SFC /scannow. Don't want to reload if at all possible.

I've tried logging on as a new user with Administrative rights & one with limited rights, still no help. Also the software is definitely legit as we sold it to him & installed it for him. System has been running for approx. 1 year. The only real change as of late is that he downloaded the newest version of adaware and installed it.

Just out of curiosity, I looked in the backup from Spybot 1.3 & saw a slew of Microsoft entries such as Internet explorer and Windows registry. I tried restoring those backups as well.

Sorry about the long post, just trying to give as much info as possible. Any help would be greatly appreciated.

PS -- I also tried searching the MSKB, but there is absolutely nothing worth while in there.