MS111 is basical optical USB mouse from DELL. It is auto supported in all operating system as per information provided on its packing. I purchased it through online website flipkart and it works fine and is fine mouse. Not very great but its ok but I am facing problem in it for scrolling, sometimes scrolling not works in one window of browser but works on on other windows so I feel problem is for proper driver required for this mouse. I searched internet but can't find any proper driver for this mouse. Please tell me sir from where I can download driver for Dell MS111 mouse for windows 7 operating system.