How to block usb storage devices in your computer without using third party software (other usb devices work,keyboard mouse etc)

This can be done by editing windows registry file

1. Type 'regedit' in search and enter. This will open windows registry edit window.
2. Open HKEY_LOCAL_MACHINE (left side)
3. Open folder named System from its subfolders
4. Open CurrentControlSet.
5. Open services.
6. Open USBSTOR.
7. In usbstor you can see a file named start, open it.
8. A small window will open and you can see number '3' in it, change it into 4 and press OK. That's all.