Vista - Split Desktop

I have done everything I can think of to try and fix this. I have a Compaq
laptop with Windows Vista. It's less than a year old, Vista was on it when I
bought it (new) My desktop is split into 4 screens. Like, there's 4 sets of
start buttons and everything. PLEASE HELP! I have shut it down, restarted,
played with different monitor/display settings, cleaned the whole thing out,
ran multiple scans and defragmenter. I have a printing company and NEED this
computer. Sure, it still works, but the screens are smaller and hard to read
because there are 4 of them! PLEASE HELP ASAP!