Sometimes there is one (or more) folders on your PC that take a very long time to load and display contents when you try to open them. This is due to the fact that Windows will try to figure out what type of content is mostly present in that folder to optimize the folder view (e.g. Pictures, Music, etc.).
You can stop this behavior by changing the folder’s content type in Properties. Right-click on folder and select Properties, then go to Customize tab. Select General Items from “Optimize this folder for” drop down list. You can also select “Apply this template to all subfolders” if you have subfolders inside with the same issue. Click Apply to apply changes, and then OK to close Properties dialog.
Change should take place immediately next time you open up that folder.