Everybody has given you different answers and each one could be right.
Anti virus and spy ware protection is only as good as their data base. If they do not have a virus in their data base, it will not find it;
there are thousands of wild viruses out there. Witch people do not know about, and because their antivirus programs do not pick them up, they think their pc is safe.
The antivirus people do not tell you this. So in my opinion they are only as good as their data base. So it is up to you to make a choice.
There are loads out there which are as good as each other, I am recommending these two, as they are my choice others will say different
Effects of computer viruses:
鈥?Some viruses are programmed to damage the computer by damaging programs, deleting files, or reformatting the hard disk.
鈥?Others are not designed to do any damage, but simply replicate
themselves and make their presence known by presenting text, video, or
audio messages.
鈥?Even these benign viruses can create problems for the computer user. They typically take up memory used by legitimate programs.
鈥?As a result, they often cause erratic behavior and can result in system crashes.
Preventive Measures:
鈥?Run a more secure operating system like UNIX.
鈥?Buy antivirus software (Some popular software is listed below).
鈥?Avoid software from unknown sources and stick to commercial software.
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