WinDirStat should tell you all you need.
http://windirstat.info/
Some excellent advice to save space on your SSD
http://thessdreview.com/ssd-guides/optimization-guides/the-ssd-optimization-guide-ultimate-windows-8-edition/
If it's a laptop use an SD card to store Docs/Pics/music, you can get a Kingston 32Gb for £12/$18...