BuddyPress.org

my website running on windows server
Wordpress version : WordPress 3.0.1.
Buddypress Version 1.2.7

i was give permission of 777, but still it doesn’t display user avatar, its display default avatar (mystery-man)
while user was upload their own avatar. but its doesnt seen in profile,.

its very urgent for me.
please give me other solution,
i was already talk with my hosting provider but he was told me permission is 777 for wp-content.
please guide me.

thanks