Block Win 7 from the Internet while allowing a Linux VM to use the net

Hi, is this possible ?  I have tried the reverse, LinuxMint boot, then a Win7 VM, which works fine blocking the internet from the Win VM form the Internet, but Windows runs a bit slow for my Image processing programs.

So have gone back to a Win 7 64 boot, and idealy want to be able to use the Linux VM (9) to browse the net, while blocking Windows from being connected to it.

Thanks in advance,  Ian in Oz.