Firefox not loading when explorer.exe running

Hello,
I recently installed SP3 and after installing it, my internet becomes a "limited connection" after almost exactly 24. So, I uninstalled SP3, and now when I try to run firefox, it won't load pages, it just does about:blank, unless I close explorer.exe, and then it loads the pages fine. Anyone have any idea on how to fix either of these problems?

I used Spybot search & destroy, and it comes up clean. I did the SDfix, and I've run out of ideas/hints. If you need any system information, just ask me, and I'll do my best to provide it.