Hello, I’m new to this forum, and this is my first post ever :). I’m not a native speaker so my English isn’t very good. Today, I bought an Arduino Uno from a local shop. Back home, I owe 4 computer. I tested my arduino on each of them, most of them work fine except for my primary computer. After install, uninstall, and countless time reboot, I tried to copy the file usbser.sys from a working computer to my computer, and it worked like a charm. I was planning to ask this question btw, but it seem like I solved it myself. I hope this could help anyone who has the same problem as I did.