I have used Kaspersky for many years, bought this version as I have both PC & Mac. But be aware it doesn't run on Mac if you have the latest operating system currently 10.9.2, you will need to contact Kaspersky who can email you an up to date version to download & install.
Having previously bought this company's iPhone & iPad screen protector I knew they were top notch. You don't want a cheap & nasty product on your expensive gadget. So when I ordered a new iPad air I searched for this screen protector, there didn't seen to be one, I contacted the company who told me one would be available shortly & they could notify me when available. I duly received an email, product was ordered & arrived next day. Take your time to apply & it's there for life. On selling my old iPad - over 2 years old & used daily it still looked like new & had kept screen in perfect condition.
Bought this for my dad's birthday to keep his new laptop dust free & to carry around & thought the design would amuse him. 15" fitted fine has a spare pocket for acc, only complaint was it really smelt obviously chemicals used in material.