Class Not Registered Error

Receive class not registered error when attempting to open hyperlinks in email. Also same message received when trying to open various applications on the start menu such as Windows Store.

Have you made any changes to your computer prior to the issue?

Method 1:
Run SFC scan. System File Checker (sfc) scan will make Windows replace corrupt or missing system files on your computer.
Steps to perform sfc scan:
a. Click Start, click All Programs, click Accessories, right-click Command Prompt, and select Run as Administrator.

b. Click Continue or supply Administrator credentials if prompted.

c. In the Command Prompt window type the following, and press Enter:

sfc /scannow
Refer this KB article for more information:
http://support.microsoft.com/kb/929833



Method 2:

Check if the issue persists in safe mode, to boot the computer in safe mode follow the below steps:

a. Restart the computer and press and hold F8 key (Press and hold f8 key before the windows logo).

b. From the advanced boot option select ‘Safe mode’.

Link you may refer to: Start you computer in safe mode:
http://windows.microsoft.com/en-US/windows7/Start-your-computer-in-safe-mode 

Read more: http://www.euask.com/topic/5867-Class-Not-Registered-Error

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