But, will you trust IE http traffic, for instance?
Or a malware that exploits the IE traffic and is 'kindly' tunnelled by WebShield
I don't trust IE period, I try never to use it if possible. I use firefox as my primary browser because it doesn't have the embedded integration in the OS of IE. My secondary browser is Avant and that is rarely used (IE based) and my fall back if all else fails IE (an extremely rare occurrence).
I have also been using the DropMyRights.msi program that allows you to run an application as if you were on a limited account (no admin rights) this stops most trojans dead in their tracks because they can't create registry entries and put files in the system folders (as far as I'm aware).
So even though I am logged on with admin rights, I have shortcut entires that run the program through the DropMyRights.exe program for all my browsers and OE. So browsers and email clients that connect to the internet don't really need admin rights, again if I do need admin rights I close the restricted browser and open the non-restricted browser.
This way I don't have to log off and log on to lower my rights.