Vista - Media Center online content keeps pausing

When I try to watch internet content such as the MTV or VH1 content on my
computer using the media center. It seems to pause every few second. It used
to work before, but we moved and ever since I hooked the computer back up I
am un able to watch anything from the intenet content. It does the same on my
Xbox 360. When I first hooked it up it said that my firewall settings wasnt
anything thru. So i turned off all of my firewalls to get it working, but it
still said that even after restarting the computer. Eventually for no reason
at all it started to work but it pauses every few seconds like it is stopping
to upload the content. I am running Windows Vista Premium and I did no
changes to my computer. I have an HP a1726x mini torre. I would like to fix
it so that it no longer pauses.