Can't Get Rid Of This Problem

I wasn't really going to bother posting this issue but I have tried 3 solutions and it still seems to happen. About an hour after tuning my computer on I get this warning message saying my computer is low on memory in which I have click OK. About a minute later though I get another one saying out of memory and if I'm on the internet the whole thing freezes and I have to reboot. If not online all the wi-fi connections go and it says none are available until I again restart my computer. This is what I've tried so far.

1. I cleared all my browser cookies and history using CCleaner which was already on.

2. I deleted a lot of unwanted files and cleared some space.

3. I used Malwarebytes which JohnB suggested here ages ago when he was Super Moderator.

But the problem still won't go away.
 
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