I have recently installed a program in Joomla 3.3 with k2 installed as default. I wish to install Seblod and wondering if the removal of k2 will affect or interfere, or should it just be deactivated?/
as K2 is CCK, the same as Seblod, you need to uninstall it - you could deactivate all of its extensions - plugins, modules etc but in my opinion it is better to just uninstall it if you are not gonna use it.
Probably your menus are now pointing to non-existent pages. Har to give you any advice as I don't know how your site is structured and if you have any content already - if not, it would be wise to delete the whole page and start from bare joomla