problem unrooting

[gizzyman]

I am trying to unroot with "root my xoom" by jason tyler (beta) and when it says starting fastboot it then just says in red "failed to process command error"
and it is not unrooting, anyone know how to fix this so it unroots?

 

[gizzyman]

Well I got it unroted, but now my wifi is not working, anyone know how to fix