|I assume, if desktop is able to connect to the internet, it's connected by wire.|
So at the bottom line, none of your wireless devices are able to connect to the internet, right.
That gets me to the conclusion, that your wireless settings in the router and/or your wireless devices are wrong.
So crosscheck the settings and try again.
Read the routers manual for howto manage that.
The original poster should always write the last response !!!
Let us know, if the problem is solved !!!