Depending on the wallet version you're using. If it's 1.5.5.0, then you can try this .dat file:
https://www.dropbox.com/s/f1xlr6gktpr2btg/kryptkoin_blockchain.zipIt's up to block 576733, this was from a windows 7 machine. Replace the old in...\AppData\Roaming\KryptKoin
If you get an error, then try...
1. You can rename new blk0001.dat to the bootstrap.dat and start the wallet.
2. You can use the option -loadblock=c:\new\blk0001.dat - loading blocks from blk0001.dat to the wallet blockchain.
You should remove old blk0001.dat before updating.my wallet is not sync from one month, what should i do, please help me, it was stock on same block from long time,latest wallet with conf file.
http://i.imgur.com/0h8oqYC.jpg