So, from the website, let's see if we can break this down...
First thing is to unpack the zip file to a temp location, then copy the Tiger directory (located inside the Themes dir) to C:\Windows\Resources\Themes
Did you do that?
Next run the UXTheme Multi-Patcher and please FOLLOW the instructions! Especially the bit about Windows XP file protection! Restart when it is finished.
I can only assume since you said you restarted, you did this? Notice it says to FOLLOW
the instructions? You did that? If I had to guess, I'd say you missed a step there and your system's trying to restore the original themeux.dll file?
By the way, Dev, I noticed his little byline and thought you'd appreciate this... "Life is hard - Itís even harder if youíre stupid" (no offense intended, just something that caught my eye).