Can´t connect arduino nano to netbook

Hello, I have problem with connecting arduino nano v3.0. I can´t connect it to my netbook acer aspire one D257 win 8 x64. In arduino IDE i have grey serial port. Can you help me pls? Thanks

This http://forum.arduino.cc/index.php?topic=145001.0 might be of some help ;)

THX a lot - i will try it =)

OK, the problem is still here. i try install modem driver from http://forum.arduino.cc/index.php?topic=145001.0 , but it don´t work. in windows i have exclamation mark in device and when i´d like to install FTDI drivers it have error - code 10.