Hello thanks for your reply :-)
U told me: In unencrypted zone it is possible to organize Wi-Fi side-jakking atacks. In order to protect yourself from it, use crypto-client or VPN...but i cannot configure or change settings in router/accesspoint(s) because it isn't mine...it belongs to the owner of the building and they don't allow changes being made by others!
Do i need to download VPN or just change settings? I mean how to set-up a (free) VPN? Any links or sites with a "how to"?