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.