Can you show me graph?
Control Panel -> Folder options:"What you're going to want to do is open up the Windows Explorer , once that is open click on the down arrow next to Organize, which is located under the Back and Forward navigation buttons. A drop down menu will pop up, select Folder and search options, once that is up, under the View tab, you want to uncheck the first option which reads "Always show icons, never thumbnails"
Folder options -> View -> Restore defaults, then reboot. If still no luck, try rebuilding the icon cache:
1. Task manager -> Processes -> End process 'explorer.exe'
2. Task manager -> File menu -> New task, type cmd.exe
3. In the Command Prompt window, type the commands one by one and press ENTER after each:
CD /d %userprofile%\AppData\Local
DEL IconCache.db /a
EXIT
4. Task manager -> File menu -> New task, type explorer.exe