For reasons I won't bore you with, I need to make the file C:\Windows\Fonts\msgothic.ttc unavailable for a while, so I want to temporarily rename it to msgothic.ttc.old. Anybody who's tried to rename an installed font file in Win7 could probably guess what happened: Then I discovered the hidden "true administrator" account on Win7/Vista. As in, the one that's called Administrator and that works like on XP (as in, no UAC). I thought I was home free. But even the true Administrator does not have permission to delete or rename this file. Even an "elevated" command prompt in the Administrator account (not that elevating it should make a difference ) does not have permission. Only TrustedInstaller does. How can I rename the file? One possibility I'm considering: I dualboot Windows 7 and Ubuntu 9.10, and the latter has access to the filesystem of the former. Do you think it would be safe to rename the file from Linux, or would the fact that Windows' system files were modified outside of Windows cause Windows to explode into an eternal mess of torture and BSODs?