Thanks to all who have offered help. I think I have fixed the problem.
Firstly, I have windows Media player 11.0.5721.5280 installed. When windows briefly detects the drive, it allocates it as "F" before losing it again, then detecting it again and loosing it again and so in a everlasting loop. Plugin is enabled in Calibre.
I had one of these multiple USP port things: one USP plug into a UBB 2 port at the back of the PC, which then divides into 4. When I remove that and plug the Kindle into the PC direct, all seems to work well.
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