If you use the /f switch on an extremely large volume (for example, 70 GB) or a volume with a very large number of files (in the millions), Chkdsk can take a long time (perhaps days) to complete. The volume is not available during this time, since Chkdsk does not relinquish control until it is done. If the system volume is being checked during the startup process, the computer is not be available until the Chkdsk process is complete.
Repairing HD is certainly an option, but that will take a long time too and what if the problems are not repairable (like Seatools have determined). Besides this hard drive is screwed up so bad that restarting the computer/laptop takes an hour because it gets stuck at logging off.
So I have decided to install OS from the scratch and load all necessary application software.
Thanks all for your recommendations.