In DCOMCnfg "Run application on this computer" is grayed out for my application on two Windows 7 machines, but it works fine on all other machines

We have a COM application that is installed on hundreds of machines around the country.  We have instructions included in our install doc of how to set up DCOMCnfg.  On one machine in the field and one machine in our lab (both happen to be Windows 7 machines) the checkbox "Run application on this computer" on the location tab in DCOMCnfg is grayed out and therefore we cannot access our engine remotely.
I turned off UAC before installing  (we found that the install works much better than way)  and it is actually still off.  I do not get any DCOM errors in the Windows Event logs when I try to access via DCOM, I just get the standard -2147023174 Server Error.  I have added CallFailureLoggingLevel to HKLM\Software\Microsoft\OLE and set it to 1 to enable logging, but still no errors in the event logs.
I pulled a DCOMTest utility off of the Microsoft site.  Initially it failed, but there were entries in the event logs indicating that it did not have the permissions it needed.  I opened up those permissions and now that test utility works fine.  So, DCOM is functioning between the two computers.
This application is used with DCOM by hundreds of people, so I know the application should be working properly.  I have uninstalled and reinstalled to verify that everything is registered properly.  I have tried turning off the firewall and the anti-virus.  I am logged in as an administrator
I am at a loss.  Any ideas?
Thanks

Hi,
This issue can occur if the current user profile does not have enough permission or related system file is corrupted. Please try the following steps to troubleshoot the issue.
1. Assure the current user account has administrator permission. If not, please add it to Administrators Group and then test the issue again.
2. Restart the machine in Safe Mode and logon to the machine with the account: administrator. Then, please check whether the option is grayed out.
3. If the option is still grayed out, please try this step.
a. Open C:\Windows\System32 folder and change the ownership of the ComUID.dll file from "trusted installer" to administrators group.
b. Rename that file as ComUID.dll.org
c. Copy the attached ComUID.dl_ file from the Windows 7 installation disk to C:\Windows\System32 folder and rename it to ComUID.dll
Thanks,
Novak

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