Did windows 10 ever work on your laptop?
I saw dell says it was not tested on your laptop.
I also don't know how you could have a more updated bios (A14) than the one it's available (A07).
Did you clean the interior of your laptop (removed the dust and applied a new layer of thermal compound on the cpu)?
If not, you could try that.
If you don't know how to do it, bring your laptop to your preferred computer repair shop or ask a friend that can do it.
You can also consider a complete virus scan, for example with
kaspersky rescue disk (click) (it needs to be burned to a cd, or in a USB key - more complicated).