Problems signing into itunes store account from windows vista

I have recently downloaded the latest version of itunes for a new computer running Windows Vista. I already have an apple ID account to use with the store and have been able to access this on other computers, but every time I try to sign in on the new computer it has an error message that the "network connection has timed out". I have searched for help for this, which appears to be a common issue, and all the recommended solutions like checking firewall settings have not helped as I am still unable to sign in. My internet connection is fine, and I am able to access the store itself, just not my account.

If anyone could help with this problem I would be very grateful.