Disk Director 10 Product Key Entry

The drive letters on one of my removeable drives were changed. Now I can not access some of my programs (wrong drive letters in calls) so I can not access my email program, among many others.

I have tried running the Director program to change the drive letters back and it appears to work ok until I say commit. Then it tells me I can't do it because I am running a trial version.

I have my original product key, but I can't find a place to enter it.

I am more or less stalled until I can change these letters back to what they are supposed to be.

Thanks.