Hey guys, this is worse than i thought. Since i've had installed 8.1 i had some problems with my external USB 3.0 hard drive. (At least it's 3.0 compatible which is irrelevant since i am using USB 2 on my computer.) I have to plug it in and out for several times and it seems quite random until it got recognized. Thought maybe it was the fault of the hard drive itself, but no, works flawless on Windows 7 / 8. So... then by coincidence i saw something. I've started the "mouserate checker" tool. As i have a Zowie AM mouse which is capable of switching it's polling rate by plugging it in and holding down a certain button i needed that, since i was cleaning my computer and wanted to get sure that i am on 1000hz. Okay, long talk, BUT it's just showing me weird numbers with a maximum of 200hz. What we / i need are some experts. Not some of the "you should update your drivers" faction. I think this is a serious problem and this is connected to the hard drive problem. It does not matter if Standard Windows USB drivers are installed or the Intel ones. Like i said, i have only USB2 ports, but it works flawless on all other OS.