https://social.microsoft.com/Forums/windows/en-US/c0ed7d49-fee5-41d9-b955-6d621e3d2f9d/invalid-license-diagnostic-results-bought-from-best-buy-pre-loaded-w-vista-1-yr-ago
There are 2 types of Mod-Auth tampers. 1) A critical system file was modified On Disk - What this means is that the file, located on the hard drive, was modified in some way. This