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It sounds like it may be time for a factory reset. You will have to input your Google account data and re-install apps, but you won't loose any you paid for. Make sure your contacts and calender are sync'd first.
menu > settings > sd & phone storage > factory reset

Selecting wipe data/factory reset from the recovery wipes all user data from the ROM so it is just like when you first flashed it.You don't flash anything if you factory reset from recovery, but you loose everything, except the ROM itself. Which means you better flash a new clean ROM.