How to remove write protected in Lexar 4GB - Lexar Electronics - Others

You may need Administrator privileges on your computer.
Plug in flash-drive.
Allow time for Windows Explorer to read it.
Run AV scan if suspect.
To get a list of attributes:
Launch Start > Run > CMD.
From the command console enter
attrib F:
(or whatever the drive letter is for your flash).
to redirect output to a text file enter (example)
attrib f:>%homepath%\flashatb.txt
From the list you should see [H]idden, [S]ystem or [R]ead only attributes for write-protected files.
You can also do it via Win Explorer by right-clicking the drive icon.
Remove all above attributes.
As a last resort, you can full-format the entire flash via explorer.
Which should wipe all files / folders on the drive.