So I stupidly installed a 120gb ssd as my C: drive and now it's nearly full, is there anyway to expand the memory by adding another hard drive? If so is there any links that can talk me through it?
No, you don't want to 'add' it to the C drive. Just move some stuff from the C to the 500GB drive. Music, video, docs....all take up a lot of space,and can be easily moved over there.