When the guys at the DEFCON and Black Hat conventions start recommending Norton, then I'll start recommending them haha. Even still, I think they face a lot of scepticism with their actual security measures so I'd stay away from them. I just don't like trusting companies with a chequered history.

Security software should be your last line of defence against vulnerabilities, so pick carefully.

In the end, it really comes down to what you do, and how you do things. Not an all-in-one solution, but it's free software. HitmanPro and Malwarebytes are common tools to supplement AV software, and Comodo offers a quality firewall. Bitdefender also has a free AV software, and you can use other programs to help keep your system clean at the same time. I would recommend Kaspersky, Webroot, or Bitdefender for paid software. Norton has a dirty history, and I wouldn't recommend going with them because of it. Could be user error, but this would be the first software that requires some special voodoo to make it auto-sandbox.

The integrated sandbox is also a semi-disappointment, as it seems like you have to manually select to sandbox an installer (even though it claims to auto-sandbox installs). Scans do well, but live protection seems somewhat lacking. The fact that I've had to manually scan text files to find viruses knocks off some points. There is one thing I do not like about its live protection methods, though it does not detect text file viruses automatically. Have I tested it personally? Not entirely. Will Qihoo protect you from known attacks? From my research, it looks like they do a pretty good job. In reality, the best method of protection from malware and remote attacks/hacks is to not use the internet. any software you trust with computer security will fail at a certain point. Norton, Bitdefender, Avira, Qihoo, AVG, Webroot. In reality, no software will keep you safe from either of the points you mentioned let's just clear that up.

Qihoo 360 total security review