I had to take my computer into the shop for a new hard drive a week ago. Worried that my bitcoin wallet (Bitcoin qt) may have been compromised, i setup a new Electrum wallet and one on my iphone. I then transferred 0.0001 BTC to each as a test. Both showed up. I then sent to lot. After the big transfer didn't show up, i checked the blockchain and it looks like a much bigger transfer was tagged onto each 0.0001 transfer cleaning me out! I'm pretty sure they're gone for good but wondering if you all think its likely to be malware or the computer guy?