404 page does not return

I have just done a fresh install of my wordpress website and i do not want to use the 404 redirected plugin anymore so i uninstalled it but all my previously redirected pages now takes forever to load and will never return 404 error page, how can i fix this please

example of pages affected are:

http://www.freshoutng.com/2013/01/10/video-dudunorth-presents-lynxxx-ikon-of-syndik8-records/dudunorth-presents-lynxxx-ikon-syndik8-records/

http://www.freshoutng.com/2013/02/18/lace-feere-whistle/

i want every deleted pages to return 404 error page

http://wordpress.org/extend/plugins/404-redirected/