Windows 7 - accidentally applied hidden folder attribute, subsequent errors

I was clicking around in my C drive because I was trying to find a folder that was hidden. I right clicked, click properties, selected the "hidden" folder attribute to the administrator folder, and clicked apply to all folders, subfolders, etc. I realized this was not the right thing because it just hid all the folders inside, so I undid it.

Afterwards, it kicked me off of skype and when I tried to log on again, it said my disk was full when it is obviously not and gave me the "disk i/o error"

In addition, I clicked firefox and it gave me a dialog box that said "Could not initialize the browser security component, etc etc and gave me another warning about my disk being full.

What did I do? Obviously my disk is not full but these two programs think it is full and is giving me error messages. Has this happened to anyone else before?

Restore to previous restore point.

hello, did you have restore point??

Just right click your C: drive again and tick 'Hidden'. Hit apply and let it finish, then untick it and hit apply, waiting for it to finish again.
Reboot after that and you should be fine. Make sure compression is also disabled.

Yes, I have tried System Restore but it still gave me the same errors!

Edit: I did let it finish when I did and undid the hidden file attribute, still gives me errors.

It's weird, every time I open firefox, it gives me that error and then opens up the same tabs I had up before I did system restore

try this command SFC /SCANNOW Command - System File Checker

Said nothing is wrong with my computer. :/

Do it again.

Its possible Firefox's profile directory has messed up. See the article below and try the suggested fixes.

Could not initialize the browser security component

Still didn't work.

Tried that as well, unchecked the read only box AND deleted the cert8 file, still the same error.