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Windows defender
No.
Windows defender software
The reason could possibly be that Windows Vista was an upgrade, and had an upgraded firewall. Windows Vista also had Windows Defender installed by default, however, XP required a download for it. Windows Vista also patched several common exploits in Windows XP which were being used in viruses.
Click small icon on bottom right setting->realtime protection-> and have box unchecked No point in doing that. You can disable for some program if you want. BUT, unless it is from a reliable big company, doing so will probably get you infected.
Yes. No operating system is 100% safe from viruses. Vista is one of the safest however. Windows Security Center, Windows Defender, and Windows Firewall, and User Account Control (UAC) are four of the ways in which Vista protects itself from malware.
If McAfee Security Suite has an anti spyware component then you will not need windows defender
Go to control panel and do security click there.
A new feature for new Vista to actively prevent and remove spyware is Windows Defender.
Windows Defender
Some of the programs that come with Windows Vista Home Premium Service Pack 1 includes Windows Defender, Windows Firewall and Windows Media Center. It also comes with Internet Explorer 7, Windows DVD Maker and Windows Flip 3D.
You can use Windows Defender to disable programs that run at startup, or using System Configuration.