Windows 7 bbcode 3b

I get random bluescreens and I don't know the cause. It just happens randomly throughout the day, sometimes when I click on links, exit a game, and other things. Can somebody help me locate the cause and help me fix it? It wont let me upload the dmp file it says invalid extension..
 
Try doing this... Go to C:\windows\minidump. Minidump files have a .dmp extension. Select all the .dmp files. Right-click sending the files to a compressed(zipped)folder. Upload that folder as a file here
 
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