i did the following things, and unsuccessfully too:
1) changed the .htaccess file ---> led to an internal server error.
2) contacted host to edit the php.ini file, according to my test.php, my max upload limit is 50M. according to cpanel's php config, i only have 2M
3) editted wp-config.php ---> was asked to remove it by wordpress.
4) changed to wordpress MU ---> editted the options, also to no avail. it says 50M, but when i want to upload the media files, still at 2M.
NOW WHAT? =( please help!