Serious problem... SD Card stopped working after format attempts

after long hours of searching...
i found this forum and i hope anybody to help me

i had
a flash memory (SDcard) 4 Gb ..Of Samsung Galaxy mobile
i was transfering some data from my PC to Mobile
Suddenly it stop copying>>and the PC & the Mobile stopped working!

I restarted the pc and the mobile..But found a STRANGE problem
every time i try to copy data from PC to SDcard through the reader..It copies for second then it stops !
also, i used the USB cable..the same problem
.,.
i tried to format firstly from the mobile..But the mobile cannot read the SDcard
I tried to format by Windows 7..The PC stop Working

I tried to search for hours ..downloaded so many programs..to format it
i found " low level format" and done
after that
it appears like a " Removable disk" at my computer
tried to format it by windows 7 and disk mangment a message pops out "device media is write-protected"

Afterthat i discovered a Serious problem
the reader of my SDcard.."in the normal condition" while making ANY ACtivity
is giving frequent red light :D
but NOW
it stops after 30 seconds>>of trying to do any activity(like formatting )
And the removable disk Drive completely disappears from my computer

the program which i've used were :
HDD low level format
HP boot drive utility
HP usb disk fomat tool

All failed

-------------

so i came here and iam expecting some help before destructing my sdcard
:D
u r my last hope

sorry about my bad english
and inconvenience

Good Night
 
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