Arduino Serial Port Greyed Out

Hi,

I want to program a Lilypad Arduino with USB but the “serial port” on the Arduino program is greyed out and not working. I went through the FTDI installation procedure @ http://www.ftdichip.com/Drivers/VCP.htm and chose Windows* with the “setup executable” since I’m using a Windows 7.

I guess I should say that I have a few ports that haven’t been working, ever…but I do have one that functions perfectly fine.

It’s driving me crazy! I don’t know what to do…I’ve been looking around, researching about how to fix this problem, but I can’t seem to get it right. ANY advice would be greatly appreciated. The underlining problem could be the computer itself, but I desperately need to program the Arduino…

Thanks