I've had a similar problem where the wallet wouldn't sync and it's stuck at like half the way to go. Nothing works, I have it encrypted and opened, I reopened it, I got fed up and deleted the blockchain (blk0001.dat and blkindex.dat). It has downloaded again about half the blockchain and is stuck at 44%. My balance says 0.000 now. Fuck my life. The firewall and whatnot is not blocking incoming connections, i have 12+ active ones.