How to Restore " Show Hidden Files and Folders " or " Folder Options "

When your system is infected with virus,first one to be get affected is "Show Hidden Files and Folders"(in Win 7 / Vista) or "Folder options" (in Windows XP). 

Folder options entry will not  appear in Windows Explorer to see hidden files and folders. Hence Virus can safely hide itself in your system

In Win7/ Vista

 "Folder and search option" will look like: 

computer has no option for “Show Hidden Files and Folders” in the Folder Options dialog.

 In Windows XP

 "Folder options"(shown in fig.) will not be available in the Windows Explorer Tools menu.

Solution:

 For Win 7/ Vista

Open regedit.exe through the start menu search or run box, then navigate down to the following key. 

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\explorer
\Advanced\Folder\Hidden]

 On the right-hand side, Look for a key "Type" and change its value to "group"as shown above. 

If the key does not exist, create a new String value.

You should be able to immediately re-open the folder properties, and the option should have returned, as you can see here:

For Window XP

Start menu->Run-> Type "regedit.exe" ->Enter 

Registry editor will open, then navigate down to the following key:

 [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 

On the right panel, Look for a value called "NoFolderOptions"

Right click on the NoFolderOptions value and choose delete

Now Navigate to: 

 [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]     

Right click on "NoFolderOptions" on the right panel and choose Delete.