Your voice is so pitch high you PC thinks it's a virus.
About TK on or off, it depends on playstyle:
TK on, you need to be carefull with what you do either around teammates or when handeling anything with a explosive blast to it......
It requires more..."finesse" instead of rushing in going all gunslinging like it was the wild west or something.
TK off: just go crazy, put mines near teammates, do a suicide bomber without the suicide and the same explosive effect......
This mode requires no finesse and is all about trowing as much C4, frags, or anything you can get your hand on in the general direction of your oponents....or friends
MT