1. Navigate to the folder :
* XP users :C:Documents and Settings\USER_NAME\Local Settings\Application Data\Activision\CoDWaW\players\profiles\
* Vista users : C:Users\USER_NAME\AppData\Local\Activision\CoDWaW\players\profiles\
2. Delete all the folders in there.
3. Create a new folder with the name of the Profile ex: XXXX (folder remains empty)
4. Create text file: active.txt (must NOT be readonly)
5. Open active.txt and type in your profile folder name (XXXX)
(active.txt NOT active.txt.txt)

this site can help u all.
i tried it and worked for me.

http://www.siddharthabbineni.com/tutorials...rror-fixed.html