This is another problem associated with the w32.USBWorm seen in the previous post. Sometimes this problem occurs even independently, without any association to the mentioned virus. This is basically due to a wrong registry key value.
The following steps have to be taken so as to restore hidden files and folders.
- Go to Start > Run, then type Regedit
- Navigate to the registry folder HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
- Find a key called ChekedValue
- Double click CheckedValue key and modify it to 1. This is to show all the hidden files
Now you should be able to view all the hidden files, and also to alter its status from folder options.