Enable Hidden Folder Options.

Some malware intentionally disable or hide Folder Options to prevent users from deleting files related to it.

To show/enable hidden Folfer Options please do the following:

1. Click on the Start > Run
2. Type “regedit” on the field and click on OK.
(if registry editor is also blocked - find the below link
http://mycompuhelp.blogspot.com/2011/04/enable-registry-editor-regeditexe-in.html )

3. Navigate to: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer

4. In the right pane, delete the entry “NoFolderOption”.

If  “NoFolderOption” is visible:
1.  Right click on the right pane
2. Click New > DWORD Value
3. Name it “NoFolderOption” (without the quotes)
4. Set the value to 0 (zero) or double click on the “NoFolderOption” type 0 at “Value data” field

You may reboot your computer to see the effect of this registry modification.

If show hidden files option is also disabled, find the below link
http://mycompuhelp.blogspot.com/2011/04/show-hidden-files-option-not-working.html