Somehow, my flash drives, SanDisk Micro Cruzer-1GB,and my USB external ard drive got writeprotected on my main computer. Any time I try to copy something into it, I receive a pop-up,"Error 19-The media is write protected." No problem copying out from it the files that are already on it. On other computers, the flash drives works properly. How do I remove the write protection? Using XP Pro/SP2. Cannot format the flash drives, even in Safe mode, or using Disk management, or command mode. However, they work properly on other computers. Am reasonably sure problem was caused by one of the apps for safety on USB drives, but I thought I checked them all out prior to uninstalling them. I am wondering if formatting the computer and reinstalling Windows will do it? Thank you.