yes you need to check that boar is saying you, also your problem can be for virus or much junk in your laptop. you can download some softwares as Ccleaner, or tune up utilities it will help u to eliminate and clean your computer registry. if your HDD is very full you can erase some things that you dont use (music, movies and other things that you really dont need or dont use). And for check virus run your analizer. and i recommend you Malwarebytes its antimalware and its excelent.
use Ccleaner is very easy here i say you how use it:
1 erase all the things and programs that you dont need (movies, songs, etc)
2 run Ccleaner and click in analize and wait until it finish. when it finished. click in tun cleaner.
3 and for the registry you do the same things.
this software isnt one of the best, but its free and can help you to keep your computer clean.
and for the game you can use game booster or other software that fast your game ( this soft only stop some activities into the pc for dedicate all the memory to the game)
i hope be of help for you friend. i am noob in this topics but it will help you a little.