Can someone help? I'm just sitting in my bed with my desktop

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Can someone help? I'm just sitting in my bed with my desktop close to me untouched then out of nowhere, I get like 10 messages saying that the memory was overflowing or something. It was saying something about the memory being full and I won't be able to access anything that would require memory use. Then after I turn it off thinking that it was just being retarded (its old as fuck so I'm kinda used to dumb shit but this has never happened) my internet gets disconnected from everything. Am I getting hacked or something because internet on any of my devices and when I do get my internet working from restarting my router, it shuts off on everything again.