Outlook Web Access logo signature issue (graphics failing to display, lots of xml garbage inserted)

I have a problem computer in my care.

I have a user, he uses outlook web access when at home or on trips.  In OWA, he has a signature.  It works fine for me on my home machine (IE 8, Win7) if I log in as him and post it, it works fine on one of his old machines (IE 8) if I log into OWA and post it, but if you log in on his Windows 7 / IE 8 Sony Vaio and post a signature, it will look fine in the message you're editing but the end user will see "Error! File not specified".

Looking at a one-word message from each of these machines with signature attached, the working ones are a few lines of HTML (img src, href, etc..).  The one from IE / OWA on the non-working machine is a page of XML comments that mention many Office products (excel, office 2007, something else) and other things such as sharepoint, openxmlformats, passport.com,officenet conferencing, etc.

I've restarted IE with no addons, no change.

Server it's connecting to is an exchange 2003 system.
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you might have to enable graphics to send them to be viewable inside the web access.  i know my sister has a hotmail account and i can't even get her messages, they are all blank.  i keep telling her i can't read them.  your best bet is to just set up a new account and that might work.  i'm sure people know better than me on this error though.
MildlyDisturbedAuthor Commented:
I decided since there were XML tags out the yin yang in the emails that were sent from his computer I was going to uninstall any product that had XML in the title.  Couldn't hurt...

I uninstalled the Microsoft Extensible XML something or other, no dice.

I uninstalled 4 things called MSXML 4.0 SP2, after that the sig popped up and looks fine.

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