driving me crazy

Hi everyone. So, about a week ago my girlfriend bought a prebuilt pc. During the first couple of days she didn't have any problems at all. But now, a week later, she is experiencing sudden shut downs when playing CS:GO. I have myself tried different solutions, but haven't succeded in anyone...

Hey Every Body I'd Like to ask about some thing in my motherboard asus z77 vlx there is a function in the MB Setting Called Increase Gpu Memory And It's set as 64 and there is an ability to up it to 1024 M , will it make a diffrence when i change it and will it need any thing more to do it ...