Well, that means the data corruption has leaked all the way to a kernel level, and is effecting everything. This very rarely
happens, but seems to have in your case.
Unfortunately you will have to perform a factory reset of the device to totally wipe that corrupt data, but its not as bad as it sounds.
As long as you have a Google account synced to your device, your contacts, calendar, etc. will be re-synced to the device after you run the initial setup again as long as you sign in with the same Google/Gmail account (as long as they were synced previously
). Any apps you have paid for, you can get back after you reset the device by opening the Market, pressing Menu on the phone and choosing "My Apps".
As far as any data that is stored on the SD Card(images, music, etc.), it will not be erased. Only the phones internal memory is formatted.
To complete a Factory Reset follow these directions:
Open the Settings App
Choose Wipe Data/Factory Reset
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