It nags you on startup by using a registry setting - there's nothing to be concerned about here. If you don't use Shockwave then there's no harm in un-installing it, but what you're seeing is normal behaviour and not a virus or malware.
Thank you very much!
Meanwhile, additionally I also able to get one of our technicians on the phone. And he confirmed that it's not a virus. He also told me how to turn off this behaviour. However, I do not understand how Adobe can produce such a software. It totally behaves like malware. Actually, our technician said that personally he considers it spyware. And I guess he's right. Because when I switched of that nag in Shockwave settings (that is absolutely hidden from the user unless you don't know exactly how to do it), the following box popped up:
So this software actually sends data from my computer to Adobe without my permission. I don't give a sh*t if it's anonymous or not. I want to be asked for permission when I install something, not things happening behind my back. Adobe obviously doesn't respect the users' will and privacy and is rather patronizing them. Such behaviour pisses me off. Bummer!
I usually turn this off when turning off the automatic updates - it's really no big deal (for me, at least). The settings also remain after installing an upgrade.