This is a long story. I have a Logitech M3550 mouse and it has worked fine for about a year now. About a week ago it started acting weird. It would stop working at some points and I thought it was the batteries and it wasn't. So I switched to one of the different USB ports for the wireless adapter for the mouse and it worked fine. Yes this does work on other computers. I've tried on more than a couple and it works perfectly fine. Other USB mouses work with my laptop as well. And other things such as iPhone chargers and whatnot. The ports are fine and the adapter is fine. More recently I would plug it in and it comes up with an error message saying that the USB device is unknown or the drivers failed to install. I tried the most simple solution by troubleshooting. It said it might fix it by re-installing the drivers. It did yet the problem was still not fixed. So I went to device manager and I found the unknown device. I would uninstall it and plug it back in and then occasionally it would come up with HID-Compliant mouse and it would work but sometimes it didn't. If it didn't then I would uninstall the HID-Compliant mouse driver and plug it back in and it would sometimes work again. At this point no matter how many times I uninstall the unknown device driver and plug it back in, it always comes back with the unknown device and it never works. I tried shutting off my computer, taking out the charger, unplugging the battery for an hour and re-trying it. It still comes up as unknown device. I tried doing the same thing in the countless different orders people on blogs claim to do it and it works. It doesn't work for me. I downloaded the Logitech software yet that doesn't help. I have absolutely no idea how to fix this stupid freakin mouse and it's extremely aggravating at this point. Again, the drivers are the issue. The mouse and ports are fine. I've also tried uninstalling all of the USB drivers under the USB Hub category or whatever on the device manager. I'm completely clueless.