I don't remember what site I found this one but you can create a shortcut with the following command so that Remote Assistance will work under IE7. I think I'm one version behind on IE7 so they may have fixed it but it has been an issue on all 3 versions I have installed.
hcp://CN=Microsoft%20Corporation,L=Redmond,S=Washington,C=US/Remote%20Assistance/Escalation/Unsolicited/Unsolicitedrcui.htm