This may be caused by 3rd party detection software conflicting with Hackshield and its background processes.
If you have any Anti-Virus, Anti-Malware, or Firewall programs please temporarily disable them and relaunch both Steam and CSN:Z to determine if you can play without interruption.
To go a step further; if you typically play with a lot of background programs running (e.g., download managers) try playing fir 15-20min with all non-essential programs closed just to see if it resolves the error.