HOW TO DISABLE WRITING IN USB?

If you are the administrator of public cafe or school,this trick will be helpful for giving protection to your system.  You can disable writing to USB.  This will prevent from file stealing.  You have to login to administrator so that you can access regedit.

Go to start .  Select run.

Type as regedit and hit enter
Now navigate to

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies

 In right panel you can find writeprotect and
Change the value to 00000001


That's all now no  one can transfer data to USB.  Now your system is protected.

HOW TO SHOW SUPERHIDDEN FILES IN XP AND VISTA?

Some files will be hidden from Users. If you want to see those files,you have to edit the registry. This hack will fit for both windows xp and Vista.

Go to Start-<run
Enter as Regedit
Navigate to 

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced

In the right panel ,you can see the superhidden registry
Right click on the SuperHidden
Change the Data value to 1.
Click ok
Exit the registry and restart the windows.