 How to recover files from USB drives after deleting files, formatting the drive or a sudden virus attack Using USB drives to work with different computers and laptops often results in infecting these devices with viruses, often system failures or file system errors. If your data was lost, follow this manual. Stop working with this USB drive and don't save anything there. Recording new files will make it impossible to recover deleted data. If the flash drive is infected with a virus, scan and fix it. It may give you access to your data. Now files can be recovered with Hetman Partition Recovery. Start the program. The file recovery wizard opens. Select the flash drive where the accidentally deleted files were stored. The files have been found. We can select the ones we need and recover them.