Welcome to Pocket PC Addict mlk! Are you trying to sync with your desktop wirelessly? Or are you trying to use your desktop as an internet connection for your HTC Wizard?
If you are trying to sync wirelessly, ActiveSync 4.x disabled this feature due to security purposes.
But if you are trying to get a wireless connection via an adhoc setup, you should be able to connect with your laptop just like you would any access point. Just make sure that you have enable the ability to connect to both Infrastructure and Ad-Hoc networks.
-Tim