windows media player not working in the internet?

Well, when you swap software you only get the base of everything. We'll call it the starting point. First search for any updates! If none are found there are a couple of sites in which you can download the newer version and check if that works. Not sure on vista but i know they are still working out the bugs in the software. You might also want to check on forums to see if anyone else is having the same problem. If so it might be a internal problem. For a last resort, do a complete system reboot, and reload vista. Not sure if that helps any but it was a shot!