Car fuse instantly blows?

Hey everybody! Okay so I just installed a new deck into my Oldsmobile Nintety-Eight. After installing it, my digital gauges wouldn't show, nor would the radio work. After some examination I realized it was the radio fuse, which I replaced. After about 30 mins I came out to find it had blown again, and now when I try to put a new fuse in, it sparks and instantly blows upon insertion of the fuse box. Someone please help me out, I cant drive if I can't see my speed!