Subject Re: Problem (un)installing Firebird
>> "The InterBase Guardian service failed to start due to the
following error: %1 is not a valid Windows NT application".

This is usually related to a bug in NT with long file name problems
with spaces in the path name. What path do you have it installed in?

See Error 0193: %1 is not a valid NT application at:,1410,25842,00.html

David R. Robinson
InterBase Installation Info -