As from the title, my pc wont recognize my phone's(LG P990) usb tethering anymore.
About 4 days ago i installed a new OS(SlimKat 4.4.4) and it was working just fine, but yesterday - when i connected my phone to pc and once again activated the tethering - it wasnt working anymore, i checked the device manager and noticed it was signed as "unrecognized device".
I reinstalled the OS few times thinking i had messed with some stuff in in but nothing changed so at some point i decided to try it on ubuntu and guess what, it works, so i directly exclude the opportunity that the problem is caused by phone and not pc.
Here a few pics(ye in italian) of the device manager;





I also tried restoring the pc to a month ago but keeps doing the same thing.
I think that's all, anyone knows what's going on?