hi,
It seems to be a virus problem. Just try to follow the steps below.
1. Go to Start --> Run, then type Regedit
2. Navigate to the registry folder HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOW ALL
3. Find a key called CheckedValue.
4. Double Click CheckedValue key and modify it to 1. It may be 0, make it 1.
This is to show all the hidden files.
let me no if it works....