[Plugin: W3 Total cache) Enabling Database Cache gives Blank page

Hello,

I have Bank page issue with plugin W3 Total cache, specifically saying with enabling database cache option in the W3 Total cache plugin. If i rename the “./wp-content/db.php” say to ” db.php.bak”, the admin page works fine. There are no problem with the site, problem is only with the dash board. I tried to remove the plugin entirely and reinstalled again, but the problem persists.
I am using WP 3.2 and PHP 5.2.17 with Server version: 5.0.92

I really need to enable this plugin. Is there anyway to do this.