windows software problems

Greetings to everyone who sees this, and who wants to help me with my problem. Let's get straight to the topic. I have a problem with Windows 7 (64 bit) operating system. I don't have any problems with starting a computer, but after a few minutes, after I get on the desktop, the Windows freezes...

I am using Samsang Core prime mobile phone. Wifi router name not showing up in available wireless networks connection in my office.