Problem with outlook express

I have a number of emails in my in box some I have viewed some I have not. I am able to delete move or otherwise use Outlook express normally

Except for:
An email update for a PM from an AK member. prior to today I had opened the email, used the link, have read this pm and deleted it from my A2K messages.
Today when I attempt to access or delete this email, outlook hangs. As soon as i highlight the email outlook hangs.

I have recycled the computer several times to no avail.

All other programs appear to work fine including whilst outlook "hangs"

I am able to X out of outlook but it leaves an empty square on my desktop. Generally I get an end non responsive program dialoge.

My anti spywear programs say I do not have spywear (apart from cookies which are now removed)

I am able to use outlook express as per normal in all respects excepting if I highlite this particular email.

Any thoughts or suggestions would be appreciated.