ok thanksu mean internet security or total security? you can run them together but it is not recomended. If u want to run them together,use only the clound engine in qihoo is/ts and disbable bitdefender/avira for realtime. qihoo with only cloud enable is compatible with other avs.
Why would you even want to run two security suites at the same time? More CPU usage, More RAM usage, More and more chances for something to go wrong....Can I run 360 alongside Eset Smart Security if I exclude the the files in program files so it won't scan each other?