I have a 4th gen. IPod Touch with IOS4 and i want to update it, but when I hit the Update button its says "contacting the IPod software server" and then after about 5 seconds it says "ITunes could not connect to the IPod software servers". Please help

I have a 4th gen. Itouch wiht IOS4 and i want to update it, but when i click the update button in ITunes it says "contacting IPod software server" and it looks like it is loading. However, after about 5 seconds it stops and says "ITunes could not connect to the IPod software server". I found the apple webpage that is supposed to help me, but when i went to the LAN settings in the control panel i found that 'Automatically detect settings" was already checked. I do not know what to do, Please help.