Here is what solved the problem for me....I simply did what this guy told me to do:
"I just have the VM set to "default adapter" and have had zero problems since I first did the windows install - it just uses the current default on my Mac (including my 3G modem).
I can even access an 802.1x wifi network via the Mac and the Windows VM just "works" as it appears the VM lets the host do all the heavy lifting w.r.t. the network connection..."
this is a re-occurring problem. for weeks everything is fine and then all of a sudden internet explorer will not load.
it has happened a few time before and cripples my work if i can't use it. i have tried all the previous solutions given and they havn't worked this time.