Vista update messes up networking

I just spent a few hours trying to fix a problem with my computer that is running Vista. I officially diagnosed the problem as being Vista, since I am running Virtual PC on the computer and have Windows XP installed and the problem did not exist. The problem that I am referring to is a poor network connection, I first noticed it last week. I had no connection to the Internet. So I thought it was my ethernet switch. I am still not convinced that has something to do with it. But anyway, when I did “ipconfig” I saw media disconnected message. I was able to connect to the Internet but when I used speedtest.net I was only able to view the download test and the upload did not work. I was also trying to use Skype and that did not work. I believe I have solved the problem, but I am waiting for my computer to restart. I was almost considering reinstalling everything but didn’t feel like doing that. I still have the problem… oh…. Darn it!