(I sign up on this site intending to post my own problem, and find myself contributing to solving 3 others before I even get around to it! )
Anyway, here's my problem. I'm still running a laptop and a PC operating on Windows XP which I need to back up from time to time. I use a WD MyPassport for that. All was fine until sometime over the summer the laptop suddenly stopped recognising the external drive: I got the "USB device not recognised. One of the USB devices attached to this computer has malfunctioned ..." message. I tried it on the PC: same thing. I assumed that the drive had indeed failed, and went out and bought another one, but that didn't work either, despite allegedly being compatible with XP. At that point, I got suspicious and plugged the external drive into my Windows 8.1 laptop, and found it was still working, so it's clearly not the drive that's at fault here.
I've been hunting around for various fixes on the internet and found some that should work, except that the general recommendation has been to assign a new letter to the drive - but if the computer doesn't recognise it in the first place I can't do that! A lot of the solutions require you to go into Disk Management via Run:, but the trouble is that when I try that I get the following message:
"Logical Disk Manager
The specified service does not exist as an installed service"
and, in the bottom of the window:
"Unable to connect to Logical Disk Manager service".
My suspicion is that some XP security update which happened over the summer is somehow preventing the drive from being read, but I don't know how to get around it.
Any suggestions would be very welcome My "backup" system at the moment consists of copying everything I do on the XP comps onto a USB and putting it on the 8.1 machine, which is hardly ideal!