Hi!, you are not alone. I have exactly the same problem with .exe files since i directly downloaded a executable file on my usb drive in my computer (Windows XP Home SP2).
Facts:
*The usb drive (a QDI disk) worked well with other computers and operating systems.
* I tried with another usb drive (a Transcend disk) and i had the same problem.
Then I guess that is a software problem, not a drive problem. Uninstalling usb drivers don't works,... i don't find any solution either.
Excuse my english, please