I will be honest with you to be really kind..
That pc is super shit, literally super shit.. 1.8ghz AMD quad-core = Unplayable processor for most games.
Graphic card : Literally super outdated..
If you want a good pc you can build a cheap i5 "K" version,
GTX 970 4gig, and you are basicly set with a new motherboard.
By the way your friend is a super lier, you need a MSI gaming laptop for atleast 1k euro te be stable 60 fps with Medium / high settings on diablo 3
You should not trust this person when it comes to pc.. Do your research on your own and dont trust friends for shit when it comes to computers