I found this researching the same problem. It has to do with installing SPs
for Office. Hope it helps...
http://support.microsoft.com/?kbid=255259
"Budman" wrote:
> When recieving email from anyone at Yahoo.com I can view the email, but when
> I click on REPLY, my outlook freezes. I use Trend Micro Internet security
> 2007. I thought it might be an update, but I installed Trend Micro 2008 on
> another machine and it also freezes, now all machines in our office freeze.
> PLEASE HELP!!!!