Anyways, details details, lets keep in mind this is not a confirmed fix its just a RUU file I was able to obtain from sprint. BUT, if it does fix your problems well remember my name its easy to say...Pojoman :P----Edit: Confirmed fix
CONFIRMATION: THIS IS A FIX FOR THE EARLY 2.2 UPDATERS!
Edit: For those who don't know how to run this, this is a full install of 2.2, and all data will be wiped for this process. I suggest backing up apps/data prior to this procedure.
Edit: Plug in your usb and run the .exe file from your desktop. The RUU will automatically reboot you into bootloader during the update.
Edit: For all those getting the "cant find usb" error. Download htc sync from here http://www.htc.com/us/support/evo-sprint/downloads/
Install it this will allow your computer to recognize your EVO's usb connection.