Yes, virus can change anything on your computer!! So be careful.
The main cause of viruses on most computers come from unprotected web browsing. The second major cause is downloading programs or attachments from senders who also have a virus on their computer.
Virus' don't help computers, they're given the name virus because they harm your computer, my suggestion, don't get a virus.
A virus
There is no real way to tell if a website has a virus unless it already has a history for attaching viruses to computers. For example, many game and sexually expicit sites are notorious for dropping viruses.
Not to all computers
Norton is a virus protection suite offered by Comcast for safe web browsing. They also offer the Constant Guard suite to enable one to browse the web safely.
yeah if your hard disk have malware they can interrupt the browsing speed MALWARE like virus,spams,trojans
a virus that is affecting many computers just get protection
Yes, computers are always consistent unless they have a virus or bug.
The Elk Cloner virus is very old, designed to run on Apple II computers. It cannot infect modern computers.
It just deletes the history of the fact the virus was on your system.
Windows computers are the target of almost every computer virus on the planet because Windows is the most popular type of OS (Operating System). Think about it, if almost 94% of the population who have computers on Earth are using Windows, don't you think hackers and virus writers will take advantage of that and aim at every Windows computer? Apple computers and like you stated, Unix computers, are less vulnerable to virus attacks because the majority of computers are Windows (that's not to say you still can't get a virus if you have Apple or Unix).