BOAC, thank you for that. This machine doesn't get a lot of 'new' requests these days - 'tis largely used in a routine and somewhat unadventurous role. I'll watch out for the points you have raised however, few things are more unpleasant than the prospect of re-installing the OS and programs. I have always stored data and My Docs on the second physical drive so - in theory anyway - they should be safe.
Thanks again, this 'forum' is exceptional in the breadth of experience available and the accuracy of advice offered.
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