Hi friends,

mine is a seven years old lenovo netbook which originally had windows XP.On its expiry in 2014 april I upgraded to windows 7.in 2 years the laptop has become very slow in response. My nephew replaced Win7 with Ubuntu which he installed using a pen drive.I can see now my laptop boots up quickly and responds better.I would like experienced members on this forum to tell me whether Ubuntu will also be needing upgradation periodically?Can I use Microsoft security essentials as AV on Ubuntu?