Hard Drive Usage?

[DKS]

Hi. My laptop has a 250Gb SSD hard drive. apart from 41Gb of films, 4Gb of music, 12.5Gb of pics and 5Gb of emulation stuff and 50Gb of games, my drive is quite full, 40Gb left. Is there an application that can tell me what uses the space and how?
Program files (X86) is 40-odd Gb, but I can't see any individual folders more than 500Mb.

TIA

[DKS]

Thanks!