BuddyPress.org

i just now enabled multisite (i.e network)
deactivated all my plugins(the blog uses buddypress)
i just added the ALLOW constant in wpconfig and also added rewrite mod in htaccess.
im having issues
i cannot login to my admin panel of my main blog(metasastra)
it goes like this :
http://www.metasastra.com/wp-login.php?redirect_to=http%3A%2F%2Fwww.metasastra.com%2Fwp-admin%2Fplugins.php&reauth=1

cannot login.

this is my htaccess:

# BEGIN AnyFont

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^images/(.*).png$ /wp-content/plugins/anyfont/img.php [L]

# END AnyFont
# BEGIN WordPress

RewriteEngine On
RewriteBase /
RewriteRule ^index.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

# END WordPress

PS: i used SubFolder
ANOTHER NOTE : had problems with Google XML Sitemaps plugin,wp-greet plugin..so i removed them.
then after allowing multi site.. i found that “Buddypress” plugin is missing.. but went to install page.. it says its “installed”
but i have disabled all my plugins

please help.how do i fix this issue?