Locking up in games like that is usually a sign of inadequate cooling. I'm sure it's one of the most taxing programs on your computer, as it causes everything to run much faster/hotter then normal. (Alot more so then web browsing and posting on forums!)
Might want to just try to clean out your computer, make sure there's no dust build up. Dust tends to insulate heat and trap it.
That's just a guess though! Usually store-bought computers dont come with many fans in them to help with cooling. (again, just a guess as to what you own)
If you need more help, lemme know. Might be able to help you run it better.