red flashing using Final Cut pro?

Hi, Gary. I start using Final Cut Pro for my videos and now every time I review my video de scream start flashing in red color…I googled it and it seems to a “common” problem with some apps. It seems also the NVIDIA has some solution because the problem is graphic driver. I download the new driver and now it says that it can not be in my Macbook. I have Inter Core 2 Duo, NVIDIA GeForce 9400M, Snow Leopard 10.6.7, etc. I do not understand why it can not be install on my Macbook….Any Idea? Any solution? Please, Thanks.
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sergio