oh ok now that i know your rooted and running a custom rom. yeah just download a ruu from this link:
http://forum.ppcgeeks.com/cdma-htc-e...pped-roms.html and it should return your phone to stock and you shouldn't have to use the unrevoked s-off as the ruu should lock the phone back up, and here is a link to the driver:
http://unrevoked.com/rootwiki/lib/ex...usb-driver.zip, hope everything works out.
***EDIT***
if i'm not mistaken you should uninstall htc sync also, here's a link to the thread about how to return to stock:
http://forum.ppcgeeks.com/htc-evo-4g...roms-wipe.html, under post 2 there is a section 6 that has how to unroot, depends on which hboot you have but that should point you in the right direction.