problems with flash disks/drives

ok... so i downloaded a couple of .rar files... when the download was done, i tested it with winrar and it said the files had no error in them...then i saved it in my flash disk... it said it still had no problems...after i went home... (i downloaded it from an internet cafe) when i tried extracting it...the files where curropt! almost all of the files i downloaded!?what in the world is happening!! i usually get this problem and i cant seem to fix it... T_Tcan anyone help?

Did you properly extract the files from the archives at the Cafe? Try retesting by redownloading a .rar onto your flashdrive etc.

reformat your flash drive and try again. Once you've copied stuff to the flash drive, wait a few minutes before removing it from the computer.

maybe the usb is infected ???

infected with a gazillion viruses... >.<