Generally, steps are the following: 1) Make sure that Parallels Tools are installed 2) Please swtich to the Shared Networking mode. If this doesn't help, click Start -> Run and execute cmd.exe. Type in the appeared window command "ipconfig /all". Then, without closing the window, click Parallels Destkop menu "Help"->"Report a Problem", send a problem report (it is not necessary to provide description) and post here the report ID.