Personally I don't care for McAfee at all.Or Norton. Get yourself Nod32 or Comodo AV. might consider getting firewall too and learn to work it to keep the nasties away.
My Computer
At a glance
windows 7 Ultimate 64 BitIntel Pentium 4 531, 3000 MHz (15 x 200)3 Gigs DDREVGA e-GeForce 9500 GT