Outlook 2007 Hangs When Message Selected

every time i select a message, outlook will hang for about 5 minutes or more before it starts working again. of course, clicking another message just causes it to hang again for another 5 minutes. the only thing that i know of is that it only happens to emails from Internet. be it "a new user has subscribed to you" email, or a "user has uploaded a new video" email... all Internet emails hang outlook. this happens on both outlook 2007 and 2010, as i have tried both.

i have also tried the following:
1) running scanpst.exe
2) running scanost.exe
3) running safe mode
4) removing the reading pane
5) repairing office
6) reinstalling office
7) removing all psts/accounts and re-adding them.
8) disabled any anti-virus add-ons

possibly other things as well, but i can't remember. i have also installed windows live mail, and that works perfectly fine with all Internet emails, so for some reason, it's related to just outlook. this problem just popped up over night. i know it was working perfectly fine one day, then just decided to spaz out the next. nothing within office/outlook/windows was changed.