How to change default desktop shortcut path for new installs

Hi, I recently changed the default install path on Windows 7 from C: to D: using regedit. However now all software and games I install have their desktop shortcut defaulted to the old install path on C:\Program Files\ which of course means they don't work and I have to change the shortcut manually. Now while this isn't a huge problem, I was wondering if there's a key in the registry that I...