thank you for your reply.
Because of my particular need for maximum speed while "protein folding", I have re-installed Mint 5 Alyssa, which gives me between 20 and 25% increase over Mint 6. I have used this disc before without trouble, but this time I had to try several times before I finally managed a full install. Having had so much trouble with re-loading Mint 5, I think that I will stick with it until perhaps the next version of Mint 64 bit (not the current one) is released.
I have kept the thread just in case I get tempted to try my luck.
Best regards Keith
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