Downloaded 3.5.1 and can't record

I downloaded 3.5.1 on my new PC (Dell Precision 3550 Tower). When I click the red ‘record’ button, I get a pop up that says “Error opening recording device. Error code 0: Success. More information about this error may be here.” But when I click on the link, there is no info on that particular error code.
When I change the Audio Host from MME to WASAPI and click the Record button, I get the proper screen but the cursor doesn’t move.
Thanks for any help you can give.