Check to see is you have active connections at the bottom of the wallet.
Try restarting windows and see if it synks, otherwise if it still isn't working, you can try adding these nodes manually

addnode=94.176.236.41
addnode=109.235.65.83
addnode=185.69.53.42
addnode=91.92.136.100
addnode=91.92.136.99
addnode=185.177.59.7

If you are still having problems, backup your wallet.dat file and reinstall the cream wallet. Make sure to back up the wallet.dat file.
This should help