QUOTE(Scott @ Jan 19 2008, 21:23)

Well I dunno about that, if it's happening across all web browsers it's probably not IPv6, especially if it works with the embedded browser. I can clearly say that I have IPv6 enabled on my connection and it does not slow down or disable web browsing. I run Firefox and have never used the IPv6 tweak to turn it off except under Linux when web browsing is slow, not nonexistent. Worth a try though I guess.
Here's a screen shot of a normal wireless connection...
Example Of My ConnectionI only say that, because EVERY time I reinstall in Windows Vista, my internet connection NEVER works. Once I disable IPv6, it starts to work again.