After the big download, I kick-started the installer and I couldn’t believe my eyes: That service pack wants to have 1475 MB free space while installation – true, that number sounds scary, but it wasn’t better with the second service pack.
Since the machine boots again, I am looking through application changes – in other words, what does not work any more. But luckily it is only the ATI-Catalyst 8.2 having problems: screen rotation does not work any more. I have not spotted anything else acting strange by now…