You can use the Windows file search, if necessary. You may need to “show hidden files” first. See the Windows Help and Support for details.
Premiere Pro[]
- XP: C:\Documents and Settings\username\Application Data\Adobe\Premiere Pro\x.x\Adobe Premiere Pro Prefs
- Vista: C:\Users\username\AppData\Roaming\Adobe\Premiere Pro\x.x\Adobe Premiere Pro Prefs
Adobe Media Encoder[]
- XP: C:\Documents and Settings\username\Application Data\Adobe\Adobe Media Encoder\x.x\AMEPrefs.xml
- Vista: C:\Users\username\AppData\Roaming\Adobe\Adobe Media Encoder\x.x\AMEPrefs.xml