Formating

And the difficulty is what ? You don't know the command format, or it simply won't format, or........

Well, you can format it by right click and format
You can also format with Administrative tools >Computer management in Control panel

Or cmd, by Start>run type cmd
To see all the options you have, first type
format /?
This will list what you need to do, depending on what you really want

You can format your stick (usually in Fat32) by default like this:
Type
format Your_usb_drive_letter:\ /Q, for a quick format...

Or you can choose different types: FAT, NTFS, etc...  

thanks it worked as magic

Glad to hear it!