url在codeigniter中重写

I was using this

RewriteEngine On
RewriteBase /
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php/$1 [L]

#RewriteRule ^(.*)$ /jukson/index.php/$1 [L,QSA]

to remove index.php from codeigniter url in my wamp.

but I have now installed windows 8 dev. preview and wamp does not run very well in this OS. So i have installed apache, mysql, php manually. All is well except that above code doesn't remove "index.php" from url and without index.php the page does not open.

First of all remove the duplicated line RewriteEngine On - leave only the first one. Also, although your pages should not load at all if mod rewrite would be disabled (you should get an error 500 page having this .htaccess), try checking if it is enabled. My advice is that is always a good idea to check the error log.