First question, cause I'm "very" interested. When did you buy this unit???

Also regarding Sam*censored NPC Studio. It's a faulty program which isn't suitable for Android devices (this one in particular). So you should have ditched this program altogether (not use it).
Regarding your problem.
Try using ODIN. look in the
sticky thread and prey that it recognizes your device. Read the guide carefully and choose your official firmware of choice - the latest is JC6 aka Android 1.6 Donut.
My advice go for Galaxo to improve your Android experience or GAOSP to try Froyo or gingerbread. Hope it helps.