Hi, i have a same problems :( i want to uninstalled w3 total cache plugins and want to install hyper cache plugins.
After i'm uninstalled the w3 total cache on the web directory, edit the wp-config.php and deleted on w3tc table on wordpress database
I got error message like this:
Warning: Cannot modify header information - headers already sent by (output started at /home/neotech-r3.com/public_html/wp-content/themes/magatheme/functions.php:48) in /home/neotech-r3.com/public_html/wp-includes/pluggable.php on line 865
I was googling but still not found how to figure it out this problems.
Perhaps someone could help me.