Both OS's need their own respective AV protection and firewall. When you boot Win7, it has no idea what kind of applications you have installed on Vista. It is like having two completely separate computers.
Kari
My Computer
Computer type
Laptop
Computer Manufacturer/Model Number
HP ENVY 17-1150eg
OS
Windows 10 Pro x64 EN-GB
CPU
1.6 GHz Intel Core i7-720QM Processor
Memory
6 GB
Graphics Card(s)
ATI Mobility Radeon HD 5850 Graphics
Sound Card
Beats sound system with integrated subwoofer
Monitor(s) Displays
17" laptop display, 22" LED and 32" Full HD TV through HDMI
Screen Resolution
1600*900 (1), 1920*1080 (2&3)
Hard Drives
Internal: 2 x 500 GB SATA Hard Disk Drive 7200 rpm
External: 2TB for backups, 3TB USB3 network drive for media
Cooling
As Envy runs a bit warm, I have it on a Cooler Master pad
Yes, if you are using licensed commercial software you will need 2 licenses for each install. Same thing with your operating system. You need a license for Vista and a license for 7.
My Computer
Computer Manufacturer/Model Number
Self-Built in July 2009
OS
Windows 7 Ultimate x64
CPU
Intel Q9550 2.83Ghz OC'd to 3.40Ghz
Motherboard
Gigabyte GA-EP45-UD3R rev. 1.1, F12 BIOS
Memory
8GB G.Skill PI DDR2-800, 4-4-4-12 timings
Graphics Card(s)
EVGA 1280MB Nvidia GeForce GTX570
Sound Card
Realtek ALC899A 8 channel onboard audio
Monitor(s) Displays
23" Acer x233H
Screen Resolution
1920x1080
Hard Drives
Intel X25-M 80GB Gen 2 SSD
Western Digital 1TB Caviar Black, 32MB cache. WD1001FALS
PSU
Corsair 620HX modular
Case
Antec P182
Cooling
stock
Keyboard
ABS M1 Mechanical
Mouse
Logitech G9 Laser Mouse
Internet Speed
15/2 cable modem
Other Info
Windows and Linux enthusiast. Logitech G35 Headset.
Not totally sure. I use Trend on my work computer because that is what my company uses.
I use Microsoft Security Essentials on my own personal machine and I have used both AVG and Avast in the past and felt they were about even with other.
My Computer
Computer Manufacturer/Model Number
Self-Built in July 2009
OS
Windows 7 Ultimate x64
CPU
Intel Q9550 2.83Ghz OC'd to 3.40Ghz
Motherboard
Gigabyte GA-EP45-UD3R rev. 1.1, F12 BIOS
Memory
8GB G.Skill PI DDR2-800, 4-4-4-12 timings
Graphics Card(s)
EVGA 1280MB Nvidia GeForce GTX570
Sound Card
Realtek ALC899A 8 channel onboard audio
Monitor(s) Displays
23" Acer x233H
Screen Resolution
1920x1080
Hard Drives
Intel X25-M 80GB Gen 2 SSD
Western Digital 1TB Caviar Black, 32MB cache. WD1001FALS
PSU
Corsair 620HX modular
Case
Antec P182
Cooling
stock
Keyboard
ABS M1 Mechanical
Mouse
Logitech G9 Laser Mouse
Internet Speed
15/2 cable modem
Other Info
Windows and Linux enthusiast. Logitech G35 Headset.
You could try Microsoft Security Essentials, free download here. It's quite light, completely free and, in fact, quite good. I'm using it on 4 computers and 3 virtual machines.
Kari
My Computer
Computer type
Laptop
Computer Manufacturer/Model Number
HP ENVY 17-1150eg
OS
Windows 10 Pro x64 EN-GB
CPU
1.6 GHz Intel Core i7-720QM Processor
Memory
6 GB
Graphics Card(s)
ATI Mobility Radeon HD 5850 Graphics
Sound Card
Beats sound system with integrated subwoofer
Monitor(s) Displays
17" laptop display, 22" LED and 32" Full HD TV through HDMI
Screen Resolution
1600*900 (1), 1920*1080 (2&3)
Hard Drives
Internal: 2 x 500 GB SATA Hard Disk Drive 7200 rpm
External: 2TB for backups, 3TB USB3 network drive for media
Cooling
As Envy runs a bit warm, I have it on a Cooler Master pad
Yes, if you are using licensed commercial software you will need 2 licenses for each install. Same thing with your operating system. You need a license for Vista and a license for 7.
that is not entirely correct, some Antivirus-programs & firewalls come with a license allowing it to be used on more than 1 computer, and others allow the software on 2 or more operating systems on the SAME computer, so it depends on what the license says.
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My Computer
Computer Manufacturer/Model Number
Dell
OS
W7-Enterprise + WS-2008 (Converted to Workstation)
CPU
P4 2,4GHz (at 1,8GHz, "slow" RDRAM, only 400MHz FSB...)