Motorola MPx220

I'm so frustrated...my phone has been powering down when I try to boot it up...so I bought a new battery (charged for 12 hours) and the same thing happens...I do a "hard reset" and now at least my phone boots up to the main menu screen but I get a "no service" message and when I try to go to other screens it bumps me back to the main default screen...its' almost like I have some sort of virus or something.

Anyone else have this problem?...anyone know how I can reinstall the software? or something else I can try short of sending it to a repair center?