install problem Mega 2560

I have a problem with install drivers. Device manager states at Device USB\VID_2341&PID_0042\85438363139351F0B052 requires further installation. I have install drivers from that confusing FtdI ( what ever site and still get the message that further install is necessary.I have no idea what drive needs to be installed. Please advise. Arduino MEGA 2560. seems to work but would like it totaly installed to prevent further problems. Thanks Grant Everson