Thumbnails and preview messed up

Hello,

If you look at the attached picture, you see how a folder with pictures looks like when I open it. A few random thumbnails get loaded, but mostly they don´t.

I have tried running disk cleanup and deleted my thumbnail cache but it didn´t help. A few months ago I did however follow a guide which was supposed to stop windows from clearing the thumbnail cache automatically, so that one didn´t have to wait so long when opening a folder with lots of pictures. Could this be what is messing with the thumbs? I can´t remember what the guide made me change though.

Thanks for answers.

Found the solution myself. For future reference:

go to user/xxx/appdata/local/microsoft/windows/ and right click on the folder "explorer". Go to the security tab, advanced and change permissions. Make sure that no delete/rewrite permissions are set to "deny".

Hmm.. seems like an odd solution.. glad to hear that fixed it for ya though!!