Topaz Freezes

I installed a plug-in for Photoshop called Topaz. I've been using it for a while and it's working perfectly until recently when it freezes Photoshop when i try to use it. I use Photoshop CS3.
Here's the link to Topaz:
http://www.topazlabs.com/topazlabs/03products/topaz_vivacity/

Perhaps your computer is lagging

There is a possibility that Topaz is corrupted, try re-installing the software or the plugin.

If it doesn't work do a system restore to the time before this happened.

Thanks