Just like that, one day everything ok, and then I see that son uses his computer all the time, no limits, nothing, program is not running at all. Uninstalled and re-installed again, but it's refused to accept computer name claiming that it's already exists or something. Sure exists and I want to have all back. So I had to change computer name and assign kids to that "new" device again. So maybe 11 years old kid managed how to kill program?. System is Windows 7, 64 bit.