wordpress 3.0 mod rewrite

does anyone have the untampered code of the htaccess file for wordpress 3.0? its the only thing i tampered with when i tried installing wordpress super cache and i think it might be messing with the posting and users section of my blog cause it keeps saying this:

Fatal error: Call to undefined method wpdb::get_blog_prefix() in D:\Hosting\5765220\html\wp-admin\includes\user.php on line 260

and i checked the wordpress docs and the one for wordpress 2.8 is this:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule !^/wp-(admin|includes)/(.*) – [C]
RewriteRule ^/(.*) http://www.mysite.com/$1 [QSA,L]
</IfModule>

also when i keep trying to uninstall the wordpress supercache plugin
it says this:

Warning: include(../../../wp-load.php) [function.include]: failed to open stream: No such file or directory in D:\Hosting\5765220\html\wp-content\plugins\wp-super-cache\uninstall.php on line 8

Warning: include() [function.include]: Failed opening ‘../../../wp-load.php’ for inclusion (include_path=’.;C:\php5\pear’) in D:\Hosting\5765220\html\wp-content\plugins\wp-super-cache\uninstall.php on line 8
UNINSTALL_WPSUPERCACHE must be set to a non-blank value in uninstall.php

please please help. im a newbie! i’d be SUPER grateful.