Hi, i really hope someone could help me, because i'm desperate. I tried everything i could find on google and didn't fix it. Here is my problem. I have acer laptop and usb mouse. At once, mouse stopped working, so I took mouse from my other PC, plugged in lap and that mouse worked. When I bought new mouse for my lap, he didn't work too. Then I tried both mices (old one and new one) on my other PC and they WORK! So I thought that usb ports doesn't work on my lap, but then I tried with usb flash, and mouse from other pc, with mouse of my friend, and all that worked on lap. So, I don't understand what is problem with mices, why my mices wont work on my lap, and mices from other computers want? How to fix this ? And one thing more, after few days, when I wanted simply to exchange one my mouse with mouse from other PC, both of my mices didn't work on other PC , but they worked before. I don't understand. Please help me.