Most likely that memory you linked will not be compatible with your system. You would not want to spend $177 to upgrade from 4GB to 8GB and get really no benefit at all. The Q6600 is a 64-bit processor so you can definitely upgrade to Windows 7 64-bit and get rid of Vista. You currently are not even able to utilize 4GB with your 32-bit system. Money would be much better spent on an SSD drive or SSD Cache drive or a video card, but not memory especially when it most likely does not support it.
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