Deleting Keyboard Shortcuts

I use keyboard shortcuts extensively. Some are application specific, some are system shortcuts. I am finding that Windows 8 shortcuts are overriding shortcuts I use in some applications, and I would like to be able to delete or reassign the system shortcut so I can use it in an application. However, while there is a myriad of posts on different people's ideas of "essential" keyboard shortcuts, I can find no information on how to change shortcuts.