Comcast is my isp
my firefox and thunderbird work perfectly with the internet, however my rhapsody and itunes cannot connect to the internet. so i cannot access the itunes music store or update my podcasts

I have turned the firewall off on my router and on my xp and when the xp firewall was on i made sure itunes was allowed access
I allowed firewall access to the itunes installer before reinstalling itunes... nothing happened
both of these programs work perfectly on my laptop when i connect to the router wirelessly
what is wrong?