Another thought...
Pronterface stores its settings in a file called .pronsolerc, its a text file without an extension. If there is one in C:\User\{user} it uses that by default, but if this one is not present it will use one located in the same directory as the one that holds pronterface.exe. If both are prersent it uses the one in c:\user\{user} ( I got caught out by this recently!).
Might be worth having a look in both places and checking what they contain.
Harvey
Pronterface stores its settings in a file called .pronsolerc, its a text file without an extension. If there is one in C:\User\{user} it uses that by default, but if this one is not present it will use one located in the same directory as the one that holds pronterface.exe. If both are prersent it uses the one in c:\user\{user} ( I got caught out by this recently!).
Might be worth having a look in both places and checking what they contain.
Harvey