What messes up a computer?

please be specific. dont just say downloading things........what things? what makes it gets messed up? which sites? which programs? what do u think of norton antivirus (i had asked a question about norton earlier please answer if u can)? this is my 4th time buying a computer. the other ones got messed up and i dont want this one to get messed up so please tell me.

What messes up a computer?norton

First, everything can be fixed, do not just go a buy a new computer. Every virus can be undone. no matter what you can fix it. Going to sites that are geared toward sexual nature, free download sites (like limewire) can cause problems with viruses and spyware. Just clean your computer once a month and you should be fine.

I do not like norton personally but to each his own.

What messes up a computer?spyware remover

I can't imagine ruining four computers. You can always run your restore disk to fix it if it is completely messed up. Adware and spyware are on so many sites its almost impossible to avoid. I would suggest getting a good virus protection software, a good firewall and yahoo has a good popup blocker on their toolbar you can download. To get rid of spyware I have a good free program you can download from the below site. You need to take care of your computer, its pretty defenseless without your help.
Well you can't prevent it from getting messed up at all. But you may lower the chance of that by ::-