Immunizing USB from Viruses and Worms - Manual Method:

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1) Open a command prompt by click Start -> Run. Type cmd and hit the Enter key.
2) In the command prompt, create a directory in the root directory of the USB drive (By Pointing cmd to the USB disk VIA its drive letter like if its G:/ then type G:/ and hit enter) with command:

mkdir AutoRun.ini

3) Move into this new directory with command:

cd AutoRun.ini

4) Create a new directory with command:

mkdir a...//

5) Exit the command prompt window with command:

exit

Remove the USB-Disk from the computer and now its immune. And whenever you will plug it into a infected computer the USB won't get infected.