https://blockchain.info/tx/53c2dcafd2d4aae6165fe9b7a7608fde0965085bd4729c01e7d7375566a114ad
 This transaction is not made by myself and around 3.364 BTC gone. There are to possible reasons: 1. Bitcoin-Qt software doesn't work properly when experiencing hardware issue. 2. My computing get hacked.

Here is a little description about my settings: I have 2 windows 7 desktop running with the same bitcoin wallet. One desktop use local disk for the Bitcoin data (wallet, blocks, and etc.), the other use store the Bitcoin data on a network drive via iSCSI. I access these two PCs using teamviewer and require two password: the teamviewer password and the password for the machine. If anyone need to send money, he would need a 3rd password for the wallet. I thought this was secure enough.

What happen was I did a upgrade to my Synology DSM (the network drive) on Feb, 17, 2014 around 12:00 at noon. So basically there was an error for on bitcoin-qt saying that "it cannot access the data". I didn't really visited those two PC for 2 days and they stay running because a few miners are connected to them or use them as proxy. Today I found that about 3.364 BTC are sent to another address from one of my address and I think it almost drained the total amount of BTC in that address.

So I am wondering if it's hardware+software issue or some hacker issue.

If it's a hacker, why didn't he/she also steal BTC from other addresses in the same wallet. And why didn't he/she drain my litecoin wallet as well. And the BTC sent has never been spent. It doesn't make any sense.

If it's a hardware+software issue, do you think if there is any way to recover them.