Get "Retrieving the COM class factory for component with CLSID..." error launching SQL Optimizer (4285626)

1.  Click Start, in the Start Menu, either in the Run Box or Search box, type regedit and press Enter.
2.  Locate your COM object GUID under HKey_Classes_Root\Wow6432Node\CLSID\{73A2F78B-F5A5-48D1-B2EC-ED4C2278555C}
3.  Once located, add a new REG_SZ (string) Value. Name should be AppID and data should be {73A2F78B-F5A5-48D1-B2EC-ED4C2278555C}
4.  Add a new key under HKey_Classes_Root\Wow6432Node\AppID\  ... The new key should be called {73A2F78B-F5A5-48D1-B2EC-ED4C2278555C}
5.  Under the new key just added, add a new REG_SZ (string) Value, and call it DllSurrogate. Leave the value empty.
6.  Create a new Key under HKey_Local_Machine\Software\Classes\AppID\   .... Again the new key should be called {73A2F78B-F5A5-48D1-B2EC-ED4C2278555C}. No values are necessary to be added under this key.

Quest Software does not provide support for problems that arise from improper modification of the registry. The Windows registry contains information critical to your computer and applications. Make sure you back up the registry before modifying it. For more information on the Windows Registry Editor and how to back up and restore it, refer to Microsoft Article ID 256986 “Description of the Microsoft Windows registry” at Microsoft Support.