I tried installing the Gangland Demo and found out that Starforce was installed on my system. Does anyone know if GOG's version does this too?

There are two problems here:
1) Gangland's Starforce may not be compatible with Windows 7. See here.
2) Starforce is a DRM, which goes againsts GOG's policies.

I've got the game installed and Starforce doesn't appear to be installed.
Looks like your good.

Alright, thanks for the heads up! :)

GOG.com removes all DRM from their games so always buy games that had starforce from here then no starforce :3