Hard drive question

[newfreestyler]

I've crashed my computer a few times and restored it with Automatic Restore. My hard drive says I'm using 31 GB of space, when the first time I only used about 6, is it possible that all the data that i lost when i crashed my PC, is still on there, using hard drive space, but unusable? if so is is it possible to delete it?

[LooseChippings]

Go into System Tools > Disk Cleanup and run that and see what happens

[newfreestyler]

I 4got 2 mention that I already did that, and it only cleared up about 90 MB of space. Any other Ideas

[LooseChippings]

Open 'My Computer' > C and list each folder and the properties for each folder.