~ I reinstalled Windows 10 not worked, I changed my OS to win 7 but not worked, Even I installed windows XP but wallet not sync at all. I installed microsoft Net freamwork but it not helped~
With all this install & re-install activities, hopefully you already saved your private key on a safe place.
Same question (as already mentioned on above comments),
what kind of QT wallet coins you were using?If BTC, i will suggest you to using hard wallet or electrum wallet.
For electrum :
For more infromation :