Totally agree with maracucho. Question raised 12 months ago, plus several times since. For the last few months I was aware my chromecast has been unavailable but wasn't urgent (infrequent use). Just recently realised that I have the same problem - uninstall Kaspersky and chromecast is immediately available. Reinstall and it disappears. Have logged a tech support request but not hopeful. Surely someone knows what is going on?