Quote:
Originally Posted by Wald07
Goes right over my head... 
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Sorry. I'll try to explain better.
On an ordinary installation of Windows you have to format your drive and install all software when you need a fresh installation. if you install crapware/adware/spyware on purpose or by accident, you need an expensive anti-virus to remove it again. Once spy-ware is installed, someone can watch your every move.
Virtualbox is a program that makes it possible to have a
virtual machine, i.e. you start virtualbox, boot the virtual machine, and it runs separately from your ordinary installation.
On the photo you see a Linux desktop with a Windows environment in a separate window; this is a virtual Windows machine. All crapware/dubious software can be installed on the virtual machine. If you get spyware on the virtual machine it doesn't affect your primary installation, and it is much easier also to delete an infected virtual installation and make a new fresh installation.
It takes some work to set it up, learn to use it, and some space for virtual storage, but it's a great way for "sandboxing" dubious/unwanted software