Tally data is corrupted due to improper shutdown.   Solution:-   First of all take the back up of tally data 2. Create a new folder under Data and rename with 5 digit number (Like 10001) 3. run f:\tally\tally9.exe c:\tally\data91 0  then press Ctrl+alt+R  and wait for some time to rewrite the data.  Now its working fine.