My computer keeps shutting down worrr

Something was wrong with my computer the other day. It keeps shutting down by itself for more than three times. I thought it must have been something that i've installed over the past few days and i went about uninstalling everything that i suspect that may be contributing to it shutting down. I even uninstalled the spyware terminator and installed a new anti-virus program. It's not one of those barebones computer, you know. It's a full featured ultra geng chau gaming machine. Too bad, i only ever use it for my blogging activities, lol. What a waste of resources.