You might try the app available via the link I posted...direct link to the download page here: http://www.spywareinfo.com/downloads/bhod/ and see if that tells you what the unknown BHO's are. This app also is supposed to be able to let you disable which ever BHO's you're not sure about so you can still use the one's you really want as long as they don't conflict with WB. If one file says it's damaged??? Maybe that's the one that's mucking things up.
Usually you can Delete that stuff without any problem, although whatever "functionality" was added might be gone. I'd also use the BHODemon app to make sure I didn't have some sneaky spyware thing that might be hard to . I'm guessing if you had some special toolbar installed on IE you'd know it. But maybe there could be something not showing up where I told you to look? I recently installed SnagIt (a really cool screen capture program, although a tad pricey) and it installed a BHO (so my antispyware monitoring app told me) and put an icon on my IE toolbar but dang if I see it in the place I told you to look. So I'd try the BHODemon to see if that helps you decide what you have and what to keep. Once you're sure whatever BHO's you have are what you really want and Delete the others, enable third party extensions and cross your fingers.
Anyway, it looks as if you've found the source of the problems you were having and it's not something that would be really obvious. Good catch on your part. Although it was IE related it wasn't really IE itself. Cool. Now at least you know you can use WB!
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