Reba
It looks like your partition information on the drive was lost.  Possibly a
virus.  Or the drive went south and crashed gone forever.
Ron


>Please let me know how to solve a computer problem that displays the
>message "invalid drive".  The computer will boot up with a diskette in
>Drive A, but each time one types "c:" to go to the c drive, the "invalid
>drive" message appears.
>
>Prior to the above problem occurring, the computer was booting up to
>Drive C okay.