Disable Thumbnail Previews in Windows 7
Speed up browsing in windows explorer by disabling thumbnail previews in folders.
Note: This article works only for Windows 7 or Vista but not on Windows XP.
1. To make this change--> click the Organize button on any folder--> and choose Folder and Search Options from the menu.
2. Click the View tab--> and then check the Always show icons, never thumbnails checkbox.
3. Click OK--> and exit the windows.