disorder with Vista top PC

I have a desktop PC moving Vista SP2, that is used by wakeful to 6 family members. Current problems include: trouble printing wirelessly. Network sharing/issues with W7 laptop. Windows Security Center was disabled. Firewall was on, but Defender was off and not accessible. Avira AntiVir program...

Source: http://forums.majorgeeks.com/showthread.php?t=252335&goto=newpost