cannot format 1G USB

i have problems with my USB. please help!
at first,i could transfer files from my PC at home, but now i couldn't. i don't know if this is happening due to windows xp sp2, because i'm using windows 98 in school and it's working.

here are the problems i am dealing with:
1. when i'm trying to delete files on my USB, a dialog box appears saying "There is no disk in the drive. Please insert a disk into drive \Device\Harddisk3\DR11.".

2. when i am transferring files from PC to USB, the dialog bx says "Cannot create or replace [file name]: The device is not ready".

3. when i'm trying to format the USB, a dialog box appears again saying that "Windows was unable to complete the format." then the windows explorer will switch to control panel.

4. sometimes, when i am plugging in the USB, the window if the drive is opening like a pop-up, and it won't stop LIKE CRAZY until i eject it.

i tried to download OnBelay but it has a licensure key and i couldn't access it, also tried to format it in disk management but it says "The format did not complete successfully." in a dialog box.

i also tried to visit the site of the manufacturer of my USB, but it has not any guides for these kind of problem.(cd-r king is the manufacturer)

if you have any ideas dealing with these problems, please let me know.

email me at wawel16@gmail.com

thanks in advance. :)