I would run the long test for the hard drive...while being prepared mentally to replace it.
But let's investigate these blue screens a bit.
Let's try this.
Download/install BlueScreenView, http://www.nirsoft.net/utils/blue_screen_view.html
Double-click BlueScreenView.exe file.
When auto-scan is done (screen results are visible), click Edit/Select All
...then File/Save Selected Items
.Save the report as BSOD.txt.Open BSOD.txt in Notepad, copy all content and paste it into your next reply