Avira antivirus users are experiencing widespread false positives with the game executable - see Rumor has it for instructions on reporting as false positive
Via CS:GO Blog:
- Users in China with a worldwide license will be prompted to play on Perfect World servers in China or outside of China.
- Those players can still manually set their launch parameters to bypass the prompt.
- “-worldwide” command line option will allow users in China to launch the worldwide version of the game to play on game servers outside of China.
- “-perfectworld” command line option will allow users outside of China to launch the “Perfect World” version of the game.