Error message when clicking rec

have Audacity 2.0.3 running vista. I can open the program but get an error msg when I click rec. (Error while opening sound device. Please check the input device settings and the project sample rate.)What is wrong?

Audacity is either pointed at a device you don’t have, or a device whose specifications are wrong.

http://manual.audacityteam.org/o/man/faq_errors.html#sound_device
Koz