Package kit killed!

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http://forums.fedoraforum.org – Hello , I have installed fedora 16... I am a new to Linux , installed with the intention of understanding Linux.... Now , when i was installing gcc compiler using yum, i got the message yum lock was held by Package kit , i failed to recognize that it is responsible for refreshing software packages in add/remove programs.... I killed that process... :( ... Now i want some packages to be installed and my package kit is nt working... Whhat shoud be done to make my add/remove softwares working as before... Thanks in advance Ajay (HowTos)