I had an Acer something or other and it got so riddled with viruses that after 13 months it was completely unusable, I've donated it to a guy at uni to use as a technology project lol.
But I'm sh*t with Windows stuff, I can't be arsed to understand how they work, can't get my head around the crappy virus software and all that gubbins.
I just bought a Mac. Cost a bomb but it works like a dream, just does what you want and explains itself fully, absolutely fantastic for Uni work and the battery lasts about 10 hours. I've not once felt like throwing it out of a window, unlike my previous laptop lol.