Hello @amritendu and Welcome to the forum
Disk errors can be caused by various things, and not necessarily the fault of Paint. net. Usually you need to run chkdsk in Windows, which you seem to have done. Please retry what you did before and report back what happens. If there is a crash, or error message, please go to the little cog in the upper right hand corner of the PDN canvas window and copy the results, if any, from the Diagnostics. There is an option to Copy to clipboard.