I have lot of sw on my PC. So i take new laptop with new OS ane crate new wallet. This laptop is dedicated only to BTC. So i think this topic should be closed. I have no clue how this could happened. No security alarm of any security SW.
I oly saw that adress 17gH1u6VJwhVD9cWR59jfeinLMzag2GZ43 belongs to some hackers/thieves beacuse I am not the only one who was robbed...
https://www.bitcoinregime.com/2014/07/07/stolen-bitcoins-and-releated-account/That address belongs to a mixing service. The hacker used it to make it harder to track the BTC.
Anti-virus software is easily defeated, that should be a "last resort". You could still have malware, so be careful.
Using a dedicated laptop is a good idea but I would recommend you use it as a offline wallet. Keep it offline at all times (physically take out the WiFi card and bluetooth if you can) and transfer signed transactions via USB stick to a computer connected to the internet.
Here are two clients that support offline wallets:
http://bitcoinarmory.comForum section for this client here:
https://bitcointalk.org/index.php?board=97.0This client does need a full copy of the blockchain plus its own database so uses up 50GB of space on your online PC.
http://electrum.orgForum section:
https://bitcointalk.org/index.php?board=98.0This is an SPV wallet, doesn't need a copy of the blockchain but it tells your peers what addresses you own so it has weaker privacy than Armory.