If you get C::B from other than the official servers we can not guarantee that it is virus-free.
But our official downloads are.
Check the suspicious files on virustotal.com and you will see.
There are some over-sensitive av-softwares outside, that make serious work hard on pc's with developping programs or even some administrative programs, that might do things normal users should not do.
I just talked to a system-administrator who has had much trouble with kaspersky that made teamviewer unable to install/work.
After many discussion with kaspersky guys and a (very late) update they have been able to make it work again.
1. {...] On continuing, it restarted, cleaned the virus (some worm - did not pay attention - it was my daughters machine). But after that is was clean. So Kaspersky did a good job.
Useless information without being more specific.
2. The other machine had Avast. It caught the virus during setup. Then cleaned it (actually removed the infected file). But installation could not proceed without it.
So it most likely removed some important stuff and renders the installed program useless.
I would not say this is a success.
3. Another machine had ESET. But ESET did not catch it. It just installed.
Maybe there is really nothing to catch.
4. As for the other 3, I don't know what AV software they use but they did nost report it.
So I don't think this is a 'false positive'. I'm kind of worried actually about my installation that went through. Even a full scan after installation did not show anything on ESET.
If I understand correctly you have two positives and two or four negatives (eset and the other three).
So why do you think it's a virus ?
I have installed C::B on many systems and none of them has any viruses (as far as I know, you can never be absolutely sure).
It might probably be possible, that you have an infected installer, if you have used it on an infected system.