Taskbar Rundll32.exe file stop working!?!

I just downloaded an awesome taskbar theme for my Windows Vista Home Premium.
But, when I clicked on it it changed it to Windows classic. Then it said 'If you want to have this theme view then you must download VistaGlazz. So I downloaded it then started it and I re-booted my PC as it told me and it was still the Windows Classic taskbar theme:confused:! Like wth. So I thought should change it back to normal (Acer). I tried then it poped an error on my screen saying "Rundll32.exe has stoped working. Please press 'Close Program' and try later." How can I fix this problem so I can get my theme back in-stead of re-installing the whole computer?!?

PS: To tell you I re-installed it 1 month ago!

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