[ubuntu] System crash 12.04 LTS

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http://ubuntuforums.org – Hi I am new to Ubuntu. Less than a year. I have a desktop system. Mostly use it for E-mail and web browsing. Running a dual boot with win 7. (needed for work) After upgrading to 12.04 I started to have problem with the system crashing. It's been getting progressively worse, about 3-5 times a day now. First thing is that the system will freeze and a couple of seconds later the screen goes dark and I get the screen that attached. nothing seems to work. I have to do a hard reset to reboot and it will work fine for a while again. Running an Intel DH57DD MB, i7, 8Gb Any suggestions on what might b (Hardware)