Some of us Found a Virus problem in Which, In the XP u could not change the setting from "Do Not Show Hidden
Folders" to "Show Hidden Folders"
When u change to "Do Not Show Hidden Folders" to "Show Hidden Folders" is Again turns into "Do Not Show"
So Friend! Here is the Solution.....
Follow the steps Baby!!!!
1. Go To... Start>run
2. Enter "regedit"
3. In The Registry editor Follow The Steps
4. Now go to right side registry list checkedvalue double click 4 edit
5. chage vale data 1 close registry editor
Now Ur Problem is Solved.....
Thank u my friend AmiT For this trick