To have reliable communication with the cRIO (either through tether or wireless bridge), it is best to disable the wireless communication on the classmate PC (that is unless you are using a wireless connection to the game router, in which case make sure you are not using the wired Ethernet connection also).
And you have to disable the windows firewall.
If you are still unable to communicate to the cRIO, then try re-imaging using a tether.
Double check your computer IP setting.
If it still doesn't work, here is a link to the NI website with some additional advanced troubleshooting methods.
http://decibel.ni.com/content/commun...ssions&start=0
Good luck!
Barry