On the View tab, under Hidden files and folders, click Show hidden files and folders.
Notes
Hidden files and folders will appear dimmed to indicate they are not typical items. Usually, hidden files are program or system files that should not be deleted or changed. To display other hidden files, clear the Hide protected operating system files (Recommended) check box.
If you know the name of a hidden file or folder, you can search for it. For more information, click Related Topics.
If you want to see all file name extensions, clear the Hide file extensions for known file types check box.
yaa tis due to viras......but sometime u can compel the tools to show
follow me....just go to run
type "fpedit.msc" press enter
dere is window...go to the user config....in window explore ...u can easly find folder option u just have to enable the button .....may b if viras is in startin state that may b seen ..im sure..