how do i remove corrupt files from jumpdrive?

while transfering files from my old computer to my new laptop using a 128 mb lexar jumdrive, my old cr*p computer froze up and i had to reboot. thus screwing up the partially transferred files. now they are all corrupt and i am unable to delete them from the jumpdrive through regular methods. i keep getting the error message "cannot read from the source file or disk." otherwise the jumpdrive works fine, just a lot of lost memory space. is there any hope, or is this space lost forever? thanks!