Solidworks side by side config error.

Hi all. I had just bought a new Sony laptop and I downgraded the os to Vista 32 bit to install my copy of solidworks. But after I install it (The install finishes) and i try to launch Solidworks from my desktop, it dosen't work. Okay, I can deal with that. But, when I go into program files to launch solidworks it just says "The application has failed to start because its side-by-side configuration is incorrect. Please see the application event log for more detail."
What does that mean and how can I fix it? (I have Solidworks 09)