virus

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sorry for the disturbance.i recently bought a system six months before.due to power interruption system shutdown automaticaly more than fifty times.at this time,i got virus from facebook.my avg antivirus had not worked for update.one of mylot friend suggest clamwin anivirus.so i download clamwin.but clamwin also refused to update.a message said,check proxy settings.i did not choose proxy setting.what next shall i do?my system is Dual-core.