ScummVM for Discworld and Discworld II: Missing Presumed...!? found at:
http://www.scummvm.org/downloads/
VirtualBox or VirtualPC for Discworld Noir (Windows 98 needs to be installed in those apps), found at:
http://www.virtualbox.org/wiki/Downloads or
http://www.microsoft.com/downloads/d...displaylang=en
The games will work 100% this way.