Hi
Thanks for the answers. I agree with Dark Mantis that although the issues seem connected, I don't think that they are.
The problem of Western Digital hard-drives being dropped is one I have come across myself and the only solution I have come up with so far, is to run the system in IDE mode rather than AHCI. I'm not sure if this is a BIOS or hardware issue and have not yet been able to find a better answer, sorry.
The problem with the Logitec wireless keyboard is another one of those annoying issues that I don't think has a reliable answer or solution. I'm pretty sure this is a Windows 7 related problem as I have come across the same kind of thing with my Wacom Graphics Tablet. A few things you could try but there is no guarantee they will solve the problem for you.
Is the dongle plugged into the USB3 or a USB2 port try changing it to see if this cures it.
In System Configuration (msconfig) under Startup, find out what other services are starting when the PC starts and remove any that are not essential. (You don't say what Windows 7 version you are running only that it is 64 bit, but if it is Ultimate try switching off Bit-Locker, if you have it running)
Try changing the start-up mode for the wireless keyboard from automatic to delayed start. (not the best solution as your keyboard will be sluggish until it starts properly about 2-3 minutes after Windows has booted).
My apologies but I don't think there is an easy answer for this issue.