Yes was a virus,and i found a worm also.
Scan with esetss 4,nortonis 2011,superantispyware,malwarebytes,mse.
Clean/delete virus from pendrive.
Copy paste everything from pendrive to new folder in desktop.
Full format pendrive,scan with esetss 4,nortonis 2011,superantispyware,malwarebytes,mse.
Scan new folder in desktop with esetss 4,nortonis 2011,superantispyware,malwarebytes,mse.
Copy everything back to pendrive,scan AGAIN pendrive with esetss 4,nortonis 2011,superantispyware,malwarebytes,mse.
Clean and happy.