You need to turn off the User Account Control (UAC), so you can use better your Vista system.
Lets take a moment to better understand: somethings that you have in Carrara dont work very well when combined togheter with other features...GI have a lot of problems when using Anything Glows and other things... you need to test somethings to see if one is crashing Carrara using togheter with others...

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