Hi,
I'm having an issue syncing my ethereum wallet with windows 64.
When seems the blockchain is downloaded entirely pretty fast (two days and just more than 10 giga) it starts from scratch again!!!
Now it's very slowly (more than two weeks) and I got more than 50 giga without sinc (now it got around 232335 blocks) and I'm pretty tired and annoyed.
Any guess? Thanks
Don't know if it helps, but i had something similar, finally it was the clock which was 1 hour behind.