I'm trying to setup a VPN on my local network, but everyone who connects to me DOES have access to my laptop but not to the internet or other devices on the network.

How can I properly configure my VPN on windows to work correctly (giving internet + access to all devices on my network to the remote pc)?

Or is there software on windows which makes creating a VPN server easier? or maybe a VMWare image linux vpn server? I can't find any of those!

My requirement is that my friends don't have to install additional software, they have to be able to connect with default windows stuff.

My OS is Windows 8 Standart edition (not pro or enterprise) OEM. Most of my friends have also windows 8, some windows 7.

Extra info:

My device is DMZ'ed (Demilitarized Zone, [disabled NAT on my device so it's accessible on the WAN])

I can access files, websites and services on other devices on my network, and all devices can access file shares, website and all other services on my device

When enabling VPN everything works except the client is unable to get internet access or access to any device on my network, client has only access to my device.