Phantom SP2 upgrade?

[Guest Ganz Doof]

I recently upgraded my Vista Premium to SP2 and then uninstalled SP2 since

one of my applications was not working with SP2.

 

Now that a patch is available for that application (which I have downloaded

and applied), I wanted to upgrade to SP2 again. I did so and was notified

that it was installed correctly.

 

Yet, when I look at the System window from the Control Panel, I see that SP1

is installed. And when I look at the Control Panel | Windows Update | Review

Update History, I see that Vista SP2 was installed successfully (on the

second installation date).

 

What gives?