protected external stick drive

I am using an external stick drive for weeks and suddenly I cannot modify or delete any file on it.
It seems like a protected drive. I can only open a file for "read" only.
I wouldn't like to reformat it (not to loose all the files on it).

How to cancel this protection?
Thanks

 

samy,

Permissions? Right click a file, Properties, Security tab. What is in the "Group or user names"?

 

Thanks for your prompt answers.
1/ I checked it. There is no switch or button on the drive side body
2/ In Properties I got only two tabs: General and Details and not Security tab
under General tab -> in Attributes Archive box is ticked . I tried to ticked the Read-only box
and got a window: " An error occured.... The media is write protected"
When I right click a file the command Delete or Rename are missing.

The drive is a Kingston DataTraveller 100G3 (64GB)

 

Does it work OK in another computer?

 

I connected it to two different computers. Same problem.
I tried to reformat it - impossible - I always got the window "write protected".
I downloaded the "Formatter Tool" from
http://www.flashdrive-repair.com/20...USB-sticks-with-any-drive-formatter-tool.html
and activated it with no success.

Do Kingston has a "On-line customer support" link?

Thanks

 

1. I sent request for assistance to Kingston. Waiting for an answer.
2. I contacted also Newegg for the same problem and got the following answer:

"

I performed the command as requested -problem not solved.