Unfortunately, the link you provided doesn't solve the problem entirely. (It's also for Windows XP. Is there an equivalent Windows 7 article?) It misses the key problem the OP has (and I had)... "I went into component services and tried to change security settings for IPBusEnum...but everything is grayed out."
The following is what I had to do before I could grant permissions to the COM component:
1. Make sure you’re logged on as an administrator.
2. Click Start, type regedit in the Search bar, then click regedit.exe
3. In the Registry Editor, press CTRL-F, type {344ED43D-D086-4961-86A6-1106F4ACAD9B} and click “Find Next”.
4. The first result is located in HKEY_CLASSES_ROOT\AppID. This is the key we need.
5. Right-click the key {344ED43D-D086-4961-86A6-1106F4ACAD9B} in the left sidebar, and then press “Permissions…”
6. We first have to change the ownership of the key. The current owner is TrustedInstaller. We have to change the owner to Administrators. Therefor, click Advanced. Then go to the tab Owner, select Administrators, check the box “Replace owner on subcontainers and objects” and press OK.
7. Now that we have changed the ownership to ourself (member of the Administrators group), we can change the permissions on the registry key. In the Permissions window, grant Administrators AND SYSTEM Full Control permissions. Then click OK to confirm the changes. In these 8 steps, we have granted the Administrators and SYSTEM account full permissions to the key HKEY_CLASSES_ROOT\AppID{344ED43D-D086-4961-86A6-1106F4ACAD9B}.
8. Verify that in this key, the value of LocalService is IPBusEnum
9. Click Start, type Component in the Search box, and then click Component Services
10. In the Component Services window, go to Computers –> My Computer –> DCOM Config. Right-click IPBusEnum and click Properties.
11. Go to the tab Security. In the Launch and Activate permissions section, select Customize and click Edit.
12. Select SYSTEM, select the permissions checkbox “Local Launch”. Then click OK to apply the change.
13. Done!
Credit for this solution goes to