this question probably is asked alot and has other ways to be fixed but i just want to share what i did. when I first DL CC it said i didn't have enough space. so i deleted ALL my other games! still not enough room. then i start deleting everthing i can think of and still no! THEN I heard about a program called Spacemonger: it shows you all the files on your computer and free space (my computer had nooo free space lol) by lots of colorful boxes. I was surprised,I still had Vindictus, CA, and all other games still on my computer but how? I thought I delete them all. unfortunately I can't delete any files from it, because I think it is broke as it is an old free version, so I tried WinDirStat and it works great. you don't believe how many files from other games you play still are on your computer! but be careful you don't want to delete something you NEED

so if you don't have the space, try WinDirStat or just go through DOWNLOADS file and delete all them things you don't need, also empty your recycle bin, then check your space. Mine went from in the red to a healthy blue :D but now probably in the red since I DL CC... i cant win but maybe you can.

good luck 

This is because when you delete something, it doesnt delete, it goes into the recycle bin. Remove games by using Add Remove programs, or if you must, If you hold down Shift+Delete, it will do a permanent delete.