Are you using the or Canary version of Xenia? What specific game are you trying to play?
Once you have legally extracted your system files, you must place them in the correct directory so Xenia can detect them. Finding your Xenia Folder xenia bios files
If a game crashes or displays blank text boxes, you may need to place legitimate Xbox 360 font files into Xenia's internal virtual file system directory ( content\0000000000000000\ ). Step-by-Step Setup Guide for Xenia Are you using the or Canary version of Xenia
Disclaimer: This article is for educational purposes. Only dump and play games that you legally own. If you're interested, I can: xenia bios files
Note that dashboard emulation is an advanced feature and not necessary for game emulation.