I am having similar problems and also my dial-up connection won't come up now when I click on IE7 icon or the outlook Express icon. Only things I have found common to this problem are missing files (iecont.dll , iecontlc.dll , and ieuinit.inf) and also installing add-ons from the IE7 tool menu under add-on manager which takes you to the Microsoft website where they tell you about add-ons for IE7. Everything started working right after I uninstalled IE7 and it took me back to IE6, I then reinstalled IE7 and it too worked fine for awhile then I installed an add on called (iespell) which is a spell checker for on-line forms and such, it works fine, but IE7 no longer brings up the dial-up connection for me.
I hope in some way this helps you to find an answer to your problems and please let me know if you find anything I might try for my problems.
Thanks, Bruce S. :