Ya, after the first start of the newly setup OS I used the IE to download Chrome and Opera. Damn! My router has a very strong password generated using KeePass, which obfuscates even the copy and paste process.

At the moment my antivir (Microsoft Essentials) states that my computer should be free, even after I rebooted etc. After that I created a new wallet using blockchain.info and I hope that now I am save?!?