Trouble when trying to install Exchange Server 2010 SP1

When trying to install Exchange Server 2010 SP1, the Setup would always throw out this error:

Mailbox Role

The following error was generated when "$error.Clear();
buildToBuildUpgrade-ExsetdataAtom -AtomName SystemAttendant -DomainController $RoleDomainController
was run: "An error occurred with error code ‘3221685221’ and message ‘Overlapped I/O operation is in progress.’.".

It had to do with the Windows Firewall being turned off.

On this server the Firewall wouldn’t work and also seemed to have “lost” a registry entry, this was why it would not load the Windows Firewall Snap-in.

Here is the registry fix for this problem:

After importing the registry entry from another server, and after I restarted the server, I was able to turn on the Firewall and then install Exchange SP1 without any problem!

A big special thanks to Ben from Microsoft for pointing me out on the right direction!

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