Users have reported issues opening Google Chrome, where they are presented with a Class Not Registered Error. The issue can occur regardless of which operating system you are on. There is a registry mess up which triggers this error, in General if you browse to the actual directory where chrome is installed, it should open. For instance, c:\Program Files (x86)\Google\Chrome on a 64-bit system or c:\Program Files\Google\Chrome on a 32-bit system. However, that will not help resolve the issue. In this guide, i will walk you through a couple of steps to address the issue permanently by addressing the registry issues.
On your computer, Hold the Windows Key and Press R to open Run Dialog. In the Run Dialog, type regedit.exe and Click OK.
Now take a backup of the registry hive, incase you delete incorrect keys and end up having more issues then now. In the left pane, click Computer, and then click File -> Export -> and save the file as registry-backup.
Once done, browse to the following keys and delete them. BE CAREFUL! Delete only those keys listed below, the subkeys (not the root keys), for example: when you expand HKY_CLASSES_ROOT, look for Chrome folder. Right click on it and delete it.
HKLM\Software\Classes\Chrome (all of it)
HKCU\Software\Classes\Chrome (all of it)
Once the keys are deleted, reboot your PC and then test to see if Chrome is working. If you end up deleting wrong keys, you can import the registry hive by opening registry editor, and clicking File -> Import -> choose the file you saved.