No thumbnails in open/save file

Hi, I used this tutorial last year, it worked fine and then just a few months ago this happened.

Whenever I save or open a file, this is is what the pop-up menu looks like > link (the folder doesn't work too, but a while ago I restored the icons to default from the tutorial, and now it looks like this)

When I open it using windows explorer and Internet Explorer (ctrl+O) it works fine, but when I use Maxthon 3, Mozilla Firefox and Google Chrome it doesn't work. So maybe the problem isn't the browser, maybe it's the computer?
I don't know what happened, it's been months since like this and it's been annoying me (because I can't choose which to upload w/o seeing the thumbnail) so I tried different solutions found in the internet that DIDN'T work:
(I'm using Windows 7 Ultimate x64)

• uninstalling then re-installing the browser
• going to folder and search options > view > unchecking "Always show icons, never thumbnails"
• going to control panel > all control panel items > performance information and tools > adjust visual effects > checking "show thumbnails instead of icons"
• going to computer > right click hard disk > properties > disk cleanup > checking "thumbnails" > clean up system files (this kind of messed up my thumbnails more)
• I tried opening command prompt then type sfc /scannow but it stopped at 20% and said "Windows Resource Protection could not perform the requested operation."

Pleeease help me