Extract it --> Double-click on "AutorunExterminator" --> Plug your pendrive now.
This will remove the autorun.inf files from drives and plug your pen drive to remove the autorun.inf file from it also. [Note : Make sure Dot Net Framework is installed in your PC.
OR Click on the below link and download the Dot Net Framework http://www.microsoft.com/downloads/en/details.aspx?FamilyID=0856eacb-4362-4b0d-8edd-aab15c5e04f5&displaylang=en]
2) Click on "Start" -->Run --> type cmd and press Enter. Here I assume your pendrive drive letter as G:
Enter this command.
attrib -h -r -s /s /d g:\*.*
You can copy the above command --> Right-click in the Command Prompt and paste it. Note : Replace the letter g with your pen drive letter.
Now check for your files.
3) After that, download the Malwarebytes' Anti-Malware from the below link