My Macbook pro is not working properly. Help?

This past week my macbook pro has been acting up. I can no longer empty my trash and every time I try I get an error code -50. I also can not move things to the trash or move any file on the desktop for that matter. For instance I can no longer drag anything on my desktop. I also can no longer change my background. I go through system preferences to the background, but when I select a new picture the background does not change. On top of all of this I can not download anything because it is saying that I do not have enough hard disk space, but I am not even using half of it. When I restart the computer it takes a long time to load up if it loads at all, and then I just have to shut it down and try to turn it back on. I am also not allowed to save any documents, I get a warning saying that the name I type is not a valid name. Lastly, the spotlight finder on the top right no longer shows up or works. These are all the problems that I have found so far. I have tried to do the utility disk check, but that just comes up as okay and doesn't give me the option to repair anything. What seems to be my problem and can I fix it?

With the Finder active, press the following key combinations, in this order:
Shift-Command-H
Command-3
Command-I
The Info window for your home folder will open. Click the lock icon to authenticate. In the Sharing & Permissions section, you should have read & write access. If not, make it so. Regardless of whether you made any changes, select "Apply to enclosed items" from the action (gear icon) menu.

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