Connecting to a PC

[TinaA]

I bought a Droid HTC 2 and when I connect the phone to my PC the computer thinks the phone is a cd not an external disk drive. My old phone worked great, I would plug it in , select "Mount as Disk Drive" and select "done". I could then transfer files from the sd card on the phone to the computer. With the new phone it isn't recognized on the computer. Help please