How to embed Latex fonts into PowerPoint?

I'm using Matlab 2014a on Windows 7.

I can create a legend with Latex formatting:

legend({'$${W_p\over{L^2}} = 1 W/m^4, U_L = 1 W/m^2K$$',...

    '$${W_p\over{L^2}} = 0.1 W/m^4, U_L = 1 W/m^2$$',...
    '$${W_p\over{L^2}} = 0.01 W/m^4, U_L = 1 W/m^2$$',...
    '$${W_p\over{L^2}} = 1 W/m^4, U_L = 3.8 W/m^2$$',...
    '$${W_p\over{L^2}} = 0.1 W/m^4, U_L = 3.8 W/m^2$$',...
    '$${W_p\over{L^2}} = 0.01 W/m^4, U_L = 3.8 W/m^2$$',...
    }, 'interpreter', 'Latex');

The figure looks OK. I can paste it into Word (as a metafile) and it is OK.

If I paste it into PowerPoint it looks OK on my own computer, but when I try it with a lecture theatre computer it has changed "/" into "=" and "." into ":".

I'm going to a conference and want it to work OK. I guess I need to embed some fonts in the PowerPoint file - but which fonts and how?

Thanks Roger