Installing USb flash drivers for K750

I am encountering problems while installing the usb flash drivers .
By mistake i pressed stop installation when the window comes to tell you to check the license of this driver. NOw whenever i connect using XS++, it does not get detected and neither does the install new hardware come up.

Also i am facing problem, the phone starts immediately when i connect it to pc(i connect it when its off and press c key)
Pls help me