Is an antivirus programme required with Vista?

Windows Vista Premium and Business claim to have better security protection, so is it necessary to have an antivirus programme installed like Norton, McAfee, etc?

Is an antivirus programme required with Vista?internet security software

while they do have better security protections, there are still the possibilities of viruses which the OS is unable to detect. you'd be wise to install an antivirus program. Windows even recommends it.

Is an antivirus programme required with Vista?moto guzzi

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Yup.
Most certainly...

Don't use Norton/McAfee as they will slow your computer down.

If you don't mind paying for the BEST virus checker in the world then visit http://www.nod32.com

I've been using this for years on XP/Vista without a single incident. It's perfect and fast too.
Virtually any OS requires anti-virus protection, especially anything from Microsoft.
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It might be a good idea to get something like McAfee or Norton. Getting Internet Security is good as those programs specialize in it. I don't know if Vista is superb with Internet Security.
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Yes, it may be more secure but security programs such as antispyware and antivirus is still recommended.
Im pretty sure it comes with an antivirus program like Windows Defender.