Need to know which one of these I need or if i need them all....listed in my add/remove program list.....or if there's something else I need to do ???

J2SE Runtime Environment 5.0 update 2 117.00MB
J2SE Runtime Environment 5.0 update 6 119.00MB
Java2 Runtime Environment SEv1.4.1_02 1.72MB
Java Web Start 99.53MB

Thanks for your help......drivermwm