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Given what you describe, I suspect you are the recipient of stolen property (it after all does say "property of RIM"). Whoever gifted it to you is not very nice to you. I suggest you treat it as what it is...stolen property. Either return it to the person who gave it to you or report it to the police.
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.