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. granteverson@yahoo.com Arduino MEGA 2560. seems to work but would like it totaly installed to prevent further problems. Thanks Grant Everson