What's taking up my memory in my computer?

Sorry if I was being pretty vague up there, but I have 32.2GB out of 287GB and I can't find what's taking up most of the space. I checked my folders, my control panel(Programs), and all of that but I still have 32.2GB left and that is really little.

Can somebody help me, please? It'd be much appreciated!

Actually I had a similar problem to you, I downloaded a free program called 'Treesize' http://www.jam-software.com/treesize_free/
It basically does the same as what Lady ElDi suggested.
I scanned my PC and the biggest folder was 'my documents' (because I had the sims 3, with so much CC and save games lol)

But anyway, I found that wasn't the problem at all... What actually was taking up my space was I had like 10 system restore points saved...
go into the start menu>all programs>accessories>system tools>disk cleanup.

You can run the cleanup tool and that will help delete temp/junk files, but at the top there should be another tab saying 'options' or something similar, click that then there should be an option to delete restore points that are older then 7 days.

I tried it and I cleared up about 25+ GBs of space! lol! Anyway good luck with it.