Firstly sorry for the long initial post... I'm a relative Android-virgin, just taken ownership of an Asus Zenpad, but a couple of days ago my Windows XP laptop stopped talking to it over the USB cable, and now I'm in a vicious circle of "found new hardware, MTP Device" > cannot install drivers > "there was a problem > (device manager yellow question-mark) > cannot update drivers manually > repeat. So far, I have tried.. 1: Using the tablet on another identical-build XP laptop, same problem. This other machine is normally used with a Samsung Galaxy no issues. I've not yet tried my laptop with their tablet. 2: My tablet with a Windows-7 desktop, straight on no issues. 3: Reinstalling Windows MTP-pack, trying to force the drivers manually, no joy. 4: Trying to find some Asus-specific MTP drivers out there on interweb, no joy so far. 5: Enabling the hidden developer menu and toggling USB-debugging, no joy. 6: Toggling the tablet between MTP & PTP modes, no joy. PTP works fine, MTP doesn't. Immediately before it stopped working, I had disabled a few of the Asus-UI apps (PC link and suchlike), but these have all now been re-enabled without success. It's also had an Android-software update of some kind - now running WW_V4.6.1_20151228 if that makes any difference. I've also had problems previously, with this laptop talking to a Windows Mobile OS device over USB which I think was also MTP-related, so I'm betting that's at the root of the problem somehow. At the moment I'm out of ideas!