Missing singer display

[rihari1]

As I stated have got my singers screen back however a box came up with this

Error processing file
C:\Users\Rick\AppData\Local\MTU\Hoster\Databases\songs.md
b

Unrecognized database format
C:\Users\Rick\AppData\Local\MTU\Hoster\Databases\songs.md
b'. (3343)
Would you like to see help?

however unable to access help due to WinHlp32.exe no longer available with Vista
After clicking the "no box" a couple of times I do get Hoster, after clicking on tools to rebuild song database the above box displays again and will not let me rebuild
In the songs database destination folder at the bottom is
C:\Users\Rick\AppData\Local\MTU\Hoster\Databases\
however I cant find this. Im not a techie person but should I be deleting this file? if I can find it
Even trying to import songs the same box comes up.

I must mention that my KMA files are on an external drive.
I have upgraded to 3320 and still the box appears
Would appreciate any help before my next gig on the weekend
Cheers
.