Jon wrote in post #9234387
Try turning off the wireless home network so your notebook is only trying to talk to the ad-hoc network. It can't talk to both - it gets confused.
I don't understand why the infrastructure wireless needs to be turned off. When you set up an ad hoc network, it's like setting up a network on a "channel" different from the infrastructure network. They both have their own SSID to identify the network you want to connect to. If you had to turn off the other network for the ad hoc network to work, then you'd have issues in the real world on location where you might have multiple people with their own laptops and wireless devices. It would be like telling everybody using PW remotes in the vicinity to stop using their PW units so that you can use yours.
Of course, you should make sure that the channel used by the ad hoc network is not the same channel used by the infrastructure network to prevent interference. The recommendation is to use a channel that is, at least, 5 channels away. So, if the infra network is on channel 11, then the ad hoc network should be on channel 6. This is for devices on the 2.4 GHz range. Setting the channel selection to Auto will work, too, although I'm not sure how much separation between channels Auto will provide.