How to delete User's Uploaded Avatars At 1 Shot ?
 

There is no function to remove all the avatars from your users with the click of one button.

Then how can i remove it.. One by one ? There are 43 K members in my forum...
Its impossible for me to do that.. Plz some one help..How abt the files.like image.php..etc..etc.

It really depends on where you have your avatars stored - file system or database. If database, you would probably just set to 0 the fields avatarid and avatarrevision in the user table as well as zap the rows in the customavatar table. I would try this on a test site first though after doing a backup.