I know this may not be Windows 10 related but I have this problem. Since I updated the BIOS of my Dell Inspiron 7720 I have a weird square acting as mouse pointer after coming out of sleep mode. See attached image. The mouse pointer becomes normal after opening an app. What I tried: updating graphics drivers for the Nvidia GT 650M and updating touchpad drivers. The newest Nvidia drivers crash the laptop. Updating the touchpad drivers at first seem to help, but didn't in the end. Hope someone has a good suggestion ! Thanks.