Error in downloading in iTunes after software update

Hi, everyone!
I have an iPod Touch that I connect with my Windows Vista computer.
I didn't have any problems when buying from iTunes before but when I updated my iPod to the 2.0 software I couldn't download apps anymore.
It just keeps on saying cannot process the request error code 1009.
What does error code 1009 mean?
Am I doing anything wrong?
Here is a screenshot of the error message dialog box:

We could not complete your iTunes Store request.
An unknown error occurred (-9838).
There was an error in the iTunes Store.
Please try again later.
Can anyone help me with this?
Thanks!
