Troubleshoot:All web pages show expired or invalid certificate Error

All web pages show expired or invalid certificate

Original title: Error Certificates__
Every Web Site I try to go to, all which I KNOW are valid, tells me there is either an expired or invalid certificate.

Solutions to the Problem All web pages show expired or invalid certificate

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Hello HARLEY MCHUGH,
What is the exact error message?
“There is a problem with this website's security certificate" when you try to visit a secured website in Internet Explorer”
http://support.microsoft.com/kb/931850
About certificate errors
http://windows.microsoft.com/en-US/windows-vista/About-certificate-errors
Regards,
Savan – Microsoft Support.

Manually editing the Windows registry to fix Error All web pages show expired or invalid certificate

Caution: Unless you an advanced computer user, we DO NOT recommend editing the Windows registry manually. Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows. We do not guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

• Click the Start button.
• Type "command" in the search box... DO NOT hit ENTER yet!
• While holding CTRL-Shift on your keyboard, hit ENTER.
• You will be prompted with a permission dialog box.
• Click Yes.
• A black box will open with a blinking cursor.
• Type "regedit" and hit ENTER.
• In the Registry Editor, select the Error 0x9C-related key (eg. Windows Operating System) you want to back up.
• From the File menu, choose Export.
• In the Save In list, select the folder where you want to save the Windows Operating System backup key.
• In the File Name box, type a name for your backup file, such as "Windows Operating System Backup".
• In the Export Range box, be sure that "Selected branch" is selected.
• Click Save.
• The file is then saved with a .reg file extension.
• You now have a backup of your MACHINE_CHECK_EXCEPTION-related registry entry.

Another Safe way to Repair the Problem: All web pages show expired or invalid certificate:

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