i'm guessing that ISO is too high for your point n shoot. a higher ISO means your camera is more sensitive to light but it also means you get a lot more noise (grainy pics). DSLRs excel at low light and high ISO performance. you should read up on the basics of photography like shutter speed, ISO, aperture, etc. until you do, all your settings will seem like gibberish and you wont know what to change in order to improve your pics
here's a nice comparison of ISO 800 between a point n shoot vs a DSLR
here's a nice comparison of ISO 800 between a point n shoot vs a DSLR

