Check your disks, make sure they arent damaged, if they are not damaged send your xbox in for repairs
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maybe the saved game is messed up i always backup my saved games on my computer. if your saved game doesn't work there is a small chance you can fix it
You should call microsoft, the number is 1-800-4MY-XBOX
To fix bugs, glitches, and stop some (But not all) hacking programs.
If your Xbox is broken you can call Xbox Support maybe they cant tell you how to fix it. Or you can send it in a gaming store as some do fix it for you.
your psp cant read games just clean the game that doesn't work then take't to gamestop