@tnbdash if you are still having issues starting your wallet pls try one of the following:
1) create a shortcut to dash-qt.exe and add " -reindex" (no quotes) to "Target" field, run your wallet using this shortcut and it should reindex the whole blockchain from block 0 - this will take some time.
2) remove
blocks and
chainstate folders and run your wallet. You'd have to redownload the whole blockchain after doing so however and this will take even more time than option (1). You can use bootstrap.dat file to speed things up a bit
https://github.com/UdjinM6/dash-bootstrap