Connection problem in every game? [HELP]

[Haseeb]

Hi guys , I just wanted to play PPSSPP online with Hamachi , I have set up everything accurately and there is nothing wrong with my set up.
When ever I go to adhoc mode of supported games , either it keeps on loading or gets stuck or shows "A communication error has occurred"
Do anybody know why is that? Yesterday my friend who can play games online flawlessly used Teamviewer to control my PC , he checked my set up and everything was alright but still the problem appears always.
I have tried different versions of PPSSPP too , created different hamachi networks and everything possible!
I've tried Monster Hunter Freedom Unite , DBZ Tenkaichi Tag Team , Tekken DR and Tekken 6 so far , I receive the same error.
What might be the problem?

PS : I have disabled fast memory , put host's ip in settings and also his mac address (changed a number but its in same format)

Please help!!!! Thanks in advance!