My computer will not save any information. Unfortunately, I was not aware of this and lost an entire paper a couple of days ago. Can anyone help to fix this problem?

You could try a third party undelete program. Also, you may be able to use previous versions. See below. http://windows.microsoft.com/en-US/windows7/Previous-versions-of-files-frequently-asked-questions

How much HD-space do you have left? Any user-quota?

Do you mean you cannot save anything in your Library or other locations?Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.