Open the "Registry Editor" ("Start" >> "Run", then type "regedit" and Enter).
Expand to the following key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
If the value "SuperHidden" exists, double-click on it to edit its value to (0 = show hidden, 1 = do not show)
If the value "SuperHidden" does not exist, create it as follows
Name: SuperHidden
Type: DWORD
Value: 0
(0: show hidden, 1: do not show)

------------------------------------------------------------------------------------OR-----------------------------------------------------------

Go to the following registry key:
HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL

DELETE the value CheckedValue in the right window. (Its type should be REG_SZ and data should be 2.)

Now create a new DWORD value called CheckedValue (same as above, except that the type is REG_DWORD). Modify the value data to 1 (0x00000001).

This should let you change the "Hidden Files and Folders" option.

This Method is working perfectily

Go to the following registry key:
HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\Adva­nced\Folder\Hidden\SHOWALL

DELETE the value CheckedValue in the right window. (Its type should be REG_SZ and data should be 2.)

Now create a new DWORD value called CheckedValue (same as above, except that the type is REG_DWORD). Modify the value data to 1 (0x00000001).

This should let you change the "Hidden Files and Folders" option.

Method 1:
Go to registry editor by running regedit in the run box.
Go to this key:
HKEY_CURRENT_USERSoftwareMicrosoft
WindowsCurrentVersionExplorerAdvanced

In the right hand area, double click hidden and change the value to 1.
Now you’re all set to go. Check it in your tools menu if the changes have taken effect.

Method 2:
1. Click “Start” -> “Run…” (or press Windows key + R)
2. Type “regedit” and click “Ok”.
3. Find the key: HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionExplorer
AdvancedFolderHiddenSHOWALL
4. Look at the “CheckedValue” key… This should be a DWORD key. If it isn’t, delete the key.
5. Create a new key called “CheckedValue” as a DWORD (hexadecimal) with a value of 1.
6. The “Show hidden files & folders” check box should now work normally. Enjoy!

Method 3:
1- Click Start –> Run –> regsvr32 /i browseui.dll –> enter
A confirmation message will appear like given below
2- Click Start –> Run –> regsvr32 /i shell32.dll
Wait for the confirmation and click OK.


Method 4:
If none of the above methods work, please download our Smart Virus Remover from here:
Smart Virus Remover

Using this Virus Remover please restore your Windows settings and your show hidden files and folders will be set to default.