I don't know if I have virus or not

I have scanned my computer with Malwarebytes, Microsoft Security Essentials, and even the Microsoft Security Scanner. I have scanned with all three because for the past few days my computer has been beeping and getting the blue screen of death. I thought

I had gotten rid of any virus I may or may not have had had, but I noticed something strange. I was done using my computer for a while, but planned to come back to it later, so I simply closed the laptop, so when I came back I didn't need to wait for the boot-up

process. When I DID come back though, the computer had already shut off, even though I didn't turn it off! It came up to a black screen that said &quotYour computer hasn't shut down properly&quot. I don't remember the full lines, but I get the screen again, I'll write

it down. I'm using the computer right now, and I have deleted all the newly downloaded programs, and kept the ones I trust.

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