.htaccess issue getting 500 errorv

hi, i tried to install multisite, and main site became in accessible.. getting 500 error .so i uninstalled that by replacing old wp config files and .htacess also removed multisite tables in db..

still my home page getting 500 error…

its my.htaccess file fore reference

#BEGIN WordPress

<IfModule mod_rewrite.c>

RewriteEngine On

RewriteBase /

RewriteRule ^index\.php$ - [L]

RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule . /index.php [L]

</IfModule>

#END WordPress

http://www.nyasatimes.com/?p=3318

this is the sample link where i am getting 500 error.. is this some thing wrong with .htaccess file or mod redirect issue in apache? or any other files needed to be change to make it work?