Windows could not search for new updates

An error occurred while checking for new updates for your computer.
Error found: Code 80070424 Windows Update encountered an unknown error.
Any help would be greatly appreciated.

Here, give this a shot:

http://www.microsoft.com/communities...5f11f70577&p=1

Thank you Kougar for your help.
I cannot get updates because my Windows 7 is not key activated.
It is my fault, I cannot activate my key until the public release of Windows 7 on October 22, 2009.
Best regards,
Pifcan