I recently bought a Hp 4710, installed the original Windows 7, my computer often freezes, no rules that will happen this time, the computer freezes when I try to run a command with the mouse arrow, it means never until now frozen in way that I did something I started before that (by itself). When this happens I can not run task manager, but it must fall on the mechanical button ignition. This computer freezing happens at least once after each time pick the computer during work ....