Security Update caused problems

I updated Outlook Express 6 with the April Security
Update #837009 and since then I cannot click a "hyper-
link" in any messages and have it take me to the web
site. I am able to click on a link and it will open a
new mail message for me to use. Something was corrupted
when this update was installed and I'm in desperate need
of help.
Can someone tell me what file needs to be changed and how
to do it, and also if that isn't possible how to take the
program back to it's previous version before the update?
Thank you for your help, Stephanie