I found the solution. I had gone into IE6 and disabled a bunch of AddOns
recently. Specifically, I had disabled the WizCombo addon, which is listed
as an unverified AddOn from Microsoft. This WizCombo AddOn is necessary for
studio's Add Class wizard dialog. I had a warning about a spyware addon and
had disabled that and thought it best to disable the WizCombo as well since
it was listed as unverified. Well, this was a bad move because, despite it
being unverified, studio needs it.
Just wanted to post this in case someone else ran into it as well. Its up
and working again now.