this will fix your problem:
http://www.htc.com/www/SupportViewNe...501&news_id=64
If you install this latest update from the htc website, it will restore your phone to factory settings (and software).
It is recommended you install this before ever taking a phone that has had a non-sprint rom installed on it. Reason being is now Sprint can choose not to repair your phone. Installing non Sprint roms can void your waranty.
To install this update, you must hook your phone up to your computer via a usb cable... just incase you did not know. You must also first install microsoft activesync 4.5 from Microsofts website.