On Windows 8:
type Folder search and options into start page, then click on Change search options for files and folders
On Windows 7:
Go to Start, then Control Panel, then Appearance and Personalization, then click Folder Options
Windows 8 and 7:
Choose View, then Advanced settings, and choose Show hidden files, folders or drives.
Click Apply, then OK.
Press win(windows logo key)+r, and type %userprofile% and press enter.
A window with your userprofile opens. To check the properties of the Temp folder, navigate Appdata/Local then right click on Temp and choose Properties. Choose the Securities tab, then choose Advanced. Edit the permissions if you need to do so.