I have some probem with my OS.
I have folder option in Tools menu, But whn I choose to show a FILES and press 'Apply+Ok' it doesnt work.
Hidden fies are not going to show. They remains hidden still.
Pls hep me how to recover this problem......
Do you have administrator privileges?

Post a Hijackthis log so we can see if anything is blocking access.
.
Download and rename HijackThis (HJT)

• Double-click on HJTInstall.
• Click on the Install button.
  
• It will automatically place HJT in C:\Program Files\TrendMicro\HijackThis\HijackThis.exe.
  
• UPON install, HijackThis should open for you.
• Close HijackThis and rename it.
  
• GO to C:\Program Files\Trend Micro\HijackThis.exe
  
• Right click on HijackThis.exe and select Rename.
  
• TYPE in sniper.exe and press Enter.
  
• Right-click on sniper.exe and select Send To > Desktop (create shortcut)

• From the desktop open Hijackthis.
• If using Windows Vista, Right-click and Run As Administrator.
  
• Click on the Do a SYSTEM scan and save a log file button
  
• Hijackthis will scan and then a log will open in notepad.
• Copy and then paste the entire contents of the log in your post.
  • Do not have Hijackthis fix anything yet. Most of what it finds will be harmless or even required.