cooldoody11 :
also my brother has the exact same pc and it work fine
Try and run a scan for Malware/viruses. (I like to use MalwareBytes).
Also, remove any bloatware that came with your system and check to see what's running in the background.
You can use the command "MSCONFIG" to change what programs run at startup too. Just go to your start menu and type in "MSCONFIG" and uncheck any programs that are not needed to run Windows.
If your games are crashing, I'm willing to bet there is something running in the background that is using all of your resources.
Also, 4Gb of RAM isn't really a lot in today's age. If you have the opportunity, try to upgrade to at least 8Gb.