I using windows vista home basic, and after installing AVG anti virus scan, i?

couldnt update it. i have try uninstalled it by right click and run as administrator and reinstall it the same way(as administrator). but after a few days of successful updating, the update window (AVG) just hang there!!! wtf!???? anything to do with windows defender??? what are the settings that i have to change?
Update: well search the microsoft website, doesnt state AVG antivirus as one of the compatible softwares.... only AVG anti spyware... already tried unistalled any trace of AVG b4 installing again.... godamm it!!! try meddling with windows defender, couldnt work as well. but im quite persistent to solve this pain in the a#$
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