Need Help With windows installer

Ok, so I dont know what happend everything just stopped workin ): , and java doesnt work nor does windows installer work,
when i try to install windows installer, it says not enough storage space to complete command.
when i try to download java it says, windows installer was not installed correctly.

ive tried everything, google, youtube, fourms, no one can help me at all.
I have no idea how to fix it, i cant download windows installer cause it allways says not enough storage space, is someone could help me, it would be amazing (:


Reinstall your operating system (we recommend Windows 7).