If those are the apps that are pushed by your carrier, then they aren't really installed and only taking minimal space. And if you delete them, the carrier will jut push them back anyway.
With the device on, pull the battery for about 30 to 60 seconds and then replace it and let the BB reboot. That will clear all of the apps running in the background.
Move all your pictures, music and ringtones tot he SD card, that is what it is there for. And read this from our FAQ: How do I free up memory on my device? - BlackBerryFAQ