Updating word check

Hello all,
I am a biology major, and it is incredibly frustrating that the vast majority of what I write about, my computer doesn't understand. Does anyone know where I can download a biology specific (or sciency-type) word checck update of some sort?
Thanks,
-new windows user

Check out the Spellex company, which sells Industry specific dictionary's: biotechnology,bioscience spell checking software dictionary

CNet Downloads has this Medical dictionary- Free Medical Dictionary Spell Checker - CNET Download.com