I ran across one article that said FF3.5 may be a cause.
I didn't have FF installed at the time of my explorer hiccup. Thing is, it hasn't had indigestion since pulling the data disc, so I'm taking it that that was the problem.
The other issue I've noticed is my internet connection sometimes doesn't start up at login... gotta go to 'network' and start it manually.
Another weird thing.... while I temporarily had Vista as the primary boot and Win 7 as secondary, the boot screen in Win 7 was the same as the Vista one... now that I've made Win 7 the primary OS it is showing the new 'pretty' boot screen. 