Any ideas ?
Yup!.....Plenty!......unfortunately!
First one is do you have any Logitech gear attached ? .... strip out/off all peripherals except the essentials, use a PS2 keyboard if you have one and boot to windows and see if you have a change
Painful Problem as there's 100s of possible causes........to make a start......a driver conflict is an obvious one..........which means, painful as it seems....going through and updating/checking all drivers for the latest versions, ... uninstalling completely before re-installing the newies.
Start with the most obvious ones and check after each boot.... report back your findings