Updating to Logitech mouse

Newbie with second hand G3 with OS8.6
installed new mouse driver and now the MAC won't boot up without a bomb icon error stating it has to restart, which I do and the same happens again, I have got no idea what to do next. I ported from a PC user and this is my first experience of the MAC machine and operating system, is there an equivalent of a SAFE boot or are there any keys I can press to get into diagnostic mode?