Again, there are two methods available to perform a hard reset of your HTC Wizard. The first method is the easiest, but seems to be the least known method:
* Open the Start menu
* Select Settings
* Select the tab System
* Select Clear Storage
* You will now be prompted with a warning about the consequences of a hard reset, and will be asked to copy a word into a form and to confirm by pressing the left Soft Button
The first method is only availalbe when your HTC Wizard is functioning correctly. If that is not the case, a second method using only hardware buttons is available:
* Press and hold both the Comm Mannager Button and the Voice Command Button
* While keeping those two buttons pressed, press the Reset Button with your stylus
* After about a second you will be prompted for confirmation. Press the Talk Button to confirm
This method is tested and works on Qtek 9100, I-mate K-JAM, MDA Vario, Orange SPV M3000, O2 XDA Mini S, Dopod 838, Cingular 8125.
source HTC Wizard Blog



I have a little problem with my MDA Vario, I tried to do the hard reset by pressing those buttons, but it didnt worked out...