Do you use DHCP? Parallels RC expiriences problems with some DHCP servers and WiFi - we are working on it. You could use manual IP assigning as workaround.
I had wireless internet in B6 but no network access. In this RC I have neither internet or access to the network with wireless. I do have network access and internet with ethernet. What manual settings could I try with wireless?
It seems that RC is incompatible with some DHCP servers in WiFi mode. We are working on this problem. To workaround the problem you could set manually IP address, DNS, default gateway. Check this topic for information on networking in Parallels - http://forum.parallels.com/thread1877.html.