To IE7 and Back Again – Now Everything’s Messed Up

I was having problems with my IE6, so I went ahead and upgraded to IE7. It was acting flakey (surprise!, surprise!) so I uninstalled. Now when I go to my Outlook Web Access, I get the navigation bar on the left, but nothing works and nothing ever loads into the right-hand pane. I’ve also gone to another vendor’s web mail access and things like the “Select All” drop down don’t select all. I know there’s a setting somewhere that I’m missing, probably something to do with ActiveX, but everything I’ve checked looks normal. I’ve even reduced the security level of my “Trusted Sites” to Low and OWA still won’t work.

Ideas anyone?