or need to do this ? ,aside from changing wallet software, it's need to delete all file in C:\Users\xxxxx\AppData\Roaming\HyperStake except "wallet.dat"
and run wallet again ? 

You are on the wrong fork I think. What you are going to want to do is to download the new version of the wallet. Go into your appdata folder (type %appdata% into windows run and go to hyperstake folder). Make a backup of wallet.dat and hyperstake.conf (if you have that) and put them in a safe place.

Now delete blk0001.dat blkindex.dat peers.dat and the database folder. Download the bootstrap.dat file from the first post. Place the extracted bootstrap.dat into the folder you just deleted everything from. Start your hyperstake.exe (the new version) and patiently wait for the bootstrap process and for your wallet to sync. If your wallet jumps out of bootstrap mode before it finishes (it should be taken through block 235k) then go back into the folder, name bootstrap.dat.old back to bootstrap.dat and then restart your wallet.

Good luck.