i get an error 21 when resoring to any OS even 4.0.2

[juan334]

i have a 3g on 3.1.3 just downgraded and jailbroken and trying to update and i keep getting an error 21 any idea

[jkmonkey]

From apple:
Error 20, 21, 34, 37: These errors typically occur when security software interferes with the restore and update process. If you are using a PC, follow this article to resolve this issue.

Try disabling your firewall.

[juan334]

well i read that but it wasnt that i was trying to restore in windows 7 and it gave me that error and i booted up winxp and now its restoring and updating fine thanks for the help