Have you did the "Register Software" by going to Help>Register then entering the license keys provided to you?
Have you downloaded the Windows Serial Drivers from the site below (if they haven't otherwise been provided)?
BCD536HP < UnidenMan4 < TWiki
If you have any of the other ARC Pro products, VC for the 536 works pretty much the same way. . .
Also, many folks are finding the rear port with the 115200 setting to work better than the front port on VC.