Problem downloading applications from iTunes

Hi experts.
I use a Windows Vista computer and have an iPod Touch+. I have never faced any problems purchasing anything from iTunes, but now while I updated my iPod to the 2.0 software, it is not allowing me to download any applications and continuously saying: Cannot process the request; Error Code 1009. What does this message mean? Please help. Thanks in advance.
We could not complete your iTunes Store request. An unknown error occurred (-9838).
There was an error in the I Tunes. Please try again later.
