You should go through and delete what you don't need. You may want to consider investing in some form of external storage medium (an external hard drive if you will). You should own an external hard drive anyways, it's good to keep your stuff backed up somewhere incase your computer dies. You don't need some huge one, like a terabyte, you just need a couple of gigs. Heck, a flash drive should do you just fine. You only need to back up the things that came from you. For example, if you downloaded a bunch of music, you don't need to back it up to a hard drive, because if your computer dies, you can always just download that again, but a picture you took and saved on your computer is yours, and you can't get that again, so you should back that up, same with school work, stuff like that. Anyways, any games you don't play anymore you should uninstall, any music you don't listen to anymore, you should uninstall. If you have iTunes, then be careful, everyone makes this mistake. When you put a song into iTunes, it creates a duplicate of the song and stores it in a library elsewhere on your computer, so once you put a song into iTunes, you should delete it, otherwise you're keeping two copies of every song, and using up twice as much disk space. There's a great program you can get to see what's using up the most space on your computer. It's called Treesize, just google it to find it. If you're using a mac, leave a comment here and I'll give you the name of a program just like it but for mac.