IE is blocking a Web site "from displaying content with security certificate errors". I can't seem to lower the security to make it display.

I'm using Internet Explorer 7.0.5730.13 on Windows XP, SP3.  I can't access a Web site that I need to purchase a product.  (It's the site).
The exact error message I'm getting is:
"To help protect your security, Internet Explorer has blocked this website from displaying content with security certificate errors.  Click here for options."
I click on the yellow bar, then I click "Display blocked content".  Then, 5 seconds later, the error message comes up again.
What have I done?
- Under Tools --> Internet Options --> Security, I have reset the Internet security level to Medium, which is the lowest level allowed.
- Under "Custom Level", I have tried to reset "Don't prompt for client certificate selection when no certificate or only on certificate exists.  The default is "Disable".  But every time I change this to "Enable", then re-open IE, the setting has gone back to "Disable".
Help, please!  Thanks.
Dwight BaerStudentAsked:
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pwrBallConnect With a Mentor Commented:
You could try adding it to your trusted sites:

Tools -> Internet Options -> Security tab, click Trusted, click Sites, add

Dwight BaerStudentAuthor Commented:
Great.  Thanks!
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