hey
go to the PIVX Data Dir. Delete all expect wallet.dat, peers.dat, masternode.conf and pivx.conf (and allways Backup your wallet.dat!).
If you don't want to resnyc from scratch you can use may chain auto backup from one of my masternodes (never older than 2 hrs)
please use this link (valid for about 45 minutes from now)
https://drive.google.com/open?id=0B_Egj11irGZyNzRYNkZFTmdMSEk
extract the tar.gz to a temp folder (use winrar if you don't know about tar.gz) and copy the blocks and chainstate folder to your data dir (u can also use my peers.dat but thats optional)
restart the wallet and you should be fine
let me know if it works and/or if you need the backup after 45 Minutes from now.