Version 7.5 does not follow the folders I detailed above. V7.5 was designed for XP/2K and has no "knowledge of" and does not use the ProgramData (or the All Users/App Data) folders.

Once you have the latest V7.5 and V8.1 installations in place the only valid folders are:
for V7.5 on Vista/XP/2K:
\My Documents\EFILive\V7.5
\Program Files\EFILive\V7.5

for V8.1 on Vista:
\ProgramData\EFILive\V8
\Program Files\EFILive\V8

for V8.1 on XP/2K:
\Documents and Settings\All Users\Application Data\EFILive\V8
\Program Files\EFILive\V8

You can delete any V7, and V8.1 folders in
\My Documents\EFILive
and
\Program Files\EFILive
as they are no longer used - but back up any files in those folders first - just in case you need/want them in future.

I moved away from the V8.1 folder naming convention back to just V8 because when V8.2 is released I didn't want to have a two sets of folders: V8.1 and V8.2 (and then V8.3, V8.4 etc)

Regards
Paul