So I built my pc about October-November 2014, and these problems have really been happening since i built it, but just getting to where i think i should fix it. Anyhow, problems include

-Upon every boot, I get a windows was shut down unexpectedly message, or something of the sort.
-I haven't recognized a pattern, except typically at boot, and at random times, the CPU fan get real loud, and spins real fast, even at idle, with nothing running, and will just go nuts.
-Also a particularly random occurrence, though also happens around boot, or wake, the entire computer with more or less freeze, but not like a full on freeze. Like if you have the browser open, everything will cease loading; you can open a new tab but it comes up blank; you can not move or minimize the window; this is true of anything running at the time of it happening. This usually last for a minute or two, and will return to normal.
-At random times, the computer will reboot. Though it has never happened to me while i was doing something, i have gotten up to get a drink, and come back to my computer on the windows login screen.

When i built it, i installed deepfreeze and froze the C drive, if that has anything to do with it. I would imagine that would cause it to not have fixed itself, but I not sure exactly what is wrong.

This is my pc, if you need that info for anything.
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Thats what I can think of right now.
Any and all help is greatly appreciated!
Thank you!