Low memory error

So I just had a terrifying moment when Windows started stuttering and Chrome started to hang, Pop up Ctrl+SHIFT+ESC and instead of being greeted by the ordinary set of tabs, I'm only shown a "LOW MEMORY" banner and a handful of processes, with only their RAM consumption shown (44% in use). By...

My computer boots successfully (especially with my new SSD) but I have now noticed a small white blinking underscore in the top left corner on a black screen during the boot process? This occurs for around 2-3 seconds and I was wondering what it is there for and is there any way I could disable...