A virus may have have made your folder options inaccessible or you have messed up your folder options registry key. Both ways, you don't want to edit your registry again. So what to do? Here is an easy solution.
If you are someone who is not comfortable with messing about your registry, download the following Rar file (it's direct download!, again) and unrar it with Winrar (download it if you don't have it), and just double click the Registry key file present. Click 'OK' when asked whether to add to registry.
Voila! All your Folder option keys are back to their default value and your settings too. Be warned that if the virus that may have caused your folder options is still around, it can easily set these settings back. For that, download some good anti viruses from our Anti virus section.
Be assured the key has been tested and proved safe. If you still don't feel sure about it, backup your registry (save a copy of the file, C:\windows\regedit.exe before running this key)
Well, for now here is the rar file with the registry key...