Steps per a number of online posts; this from Tom's Hardware
1. Shutdown your computer or laptop
2. Insert USB Memory Stick into your laptop or Computer
3. Turn on computer and then immediately start pressing (F8) key then Advanced Boot Options screen will come up
4. Select Safe Mode with Command Prompt
5. After loading files if your USB Memory Stick drive letter is (G) for example then write as
6. C:\windows\system32>G: and press enter
7. G:\>format G: and press enter
8. If ask you (Y/N) then press (Y) and press enter
9. Now a full format will start which remove write protection from USB Memory Stick.
Needless to say you have to get the drive letter correct which is not necessarily G:! I could not take my PC offline to reboot so I could not try it. The "C:\windows\system32>G:" is not very clear. I assume that "C:\windows\system32>" is what first appears and then you type "G:" to change the prompt to G:\>. That is then followed by entering "format G:". Anyway, whatever works.
PS To be absolutely sure you have the correct drive letter, at the G:\> prompt, type dir and you should see a listing of the two files (or folder if that is where they are).
Edited by Nanobyte, 28 January 2013 - 11:11 PM.