Have you got a problem with iTunes? An unknown error -9808? Well after much, much dicking about looking for a solution I found the problem was with DNS. More specifically the DNS settings on my router. (I use a Belkin Router and BT Broadband).
If you’re suffering from the same problem that had me unable to connect to iTunes for weeks, then I suggest you take a look at http://www.opendns.com and use their free DNS service instead of your current settings.
It’s free, really easy and hassle free. Had me connected to iTunes within about 5 mins. Remember. once you’re done. Reboot your PC.