Go to task manager. When it opens make sure you have clicked "More Details." Then in the tabs across the top click the "Details" tab. End Process Tree for aerohost.exe, and then dwm.exe. This is done by right-clicking on each one, and selecting "end process tree." Now you can copy files into C:\AeroGlass. Restart. Welp, that at least allowed me to copy over stuff from the 10074-64 folder... so thank you for that, I'll keep that for future reference.... though... Aero Glass doesn't work with build 10130 yet. Maybe it will if Microsoft puts the debug symbols online, but as of earlier today they hadn't done so. -Noel ...Glass indeed doesn't work (at least for me) on 10130. hopefully soon