Hi , Yes I have antimalware installed and antivirus , I only ever access the wallet to add ethereum , I only visually look at the wallet through etherscan ? this is where I noticed that my ethereum was cleared out ? I did have teamviewer running both on my PC and phone (big mistake I have read) .. could it really have been this app that has hacked my wallet ? I have heard stories of bitcoin disappearing via teamviewer but never ethereum ? I am putting it down to foolishly having this installed as I can see no other way my wallet could have been accessed ? All keys and addresses are held offline on usb stick I have never given address out apart from ETHBET crowdsale and EOS .. I did very recently have 1000 CNX airdropped into my account which seemed strange but this is the only access that has been gained to my wallet. Could it really have been teamviewer ? If so I have electrum/neo/strat/iota wallets all running on my computer and even the EOS and ETHBET in the same MEW wallet but these weren't touched ? likewise my other wallets untouched ? just the ethereum out to this unknown address ? 
thanks again in advance.