NOD32 for virus stuff, nothing really for a firewall and nothing really for an adware scanner. Im the only one who uses the computer and know what to lookout for as far as adware and stuff goes. The reason i think it may be the hard drive is while windows xp is still starting up, when you get the logo and the little bar below it moving, it usually restarts then. Then IF I get it to boot which occasionally it does, it always says windows has recovered from a serious error. After everything is done starting up and i try to start firefox or more recently even try to transfer some of my files to my external hard drive it reboots itself.