Due to power failure my windows closed unexpectedly. Now the cheque system is not working.

When I click the cheque system icon, it is showing the error of Database locked.

What should i do next?

Please follow the steps below to fix the issue.
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1. In Windows Explorer, change to "My Documents" folder

2. Change to ChequeSystem\db\ folder

3. Delete the following two files
cheque.lck
cheque.log

4. Please check and ensure following files are exists
cheque.script
cheque.properties

5. Done. You can start ChequeSystem as usual.
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