Antivirus and firewall on your home computer are not protecting you from all malware. Depending on your browsing habits, and which kind of downloads you are doing, and from where, you also would benefit from VPN, network firewall and sandboxing. Sandboxie is a tool which can sandbox your browser so that any changes and downloads do not get into your normal computer area but stays inside the sandbox, unless you explicitly move the files to your normal area. And after each browsing session, all the temporary data can be automatically deleted.
As it describes in their page:
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Web Browsing
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Secure your favorite web browser and block malicious software, viruses, ransom-ware and zero day threats by isolating such attacks in the Sandbox; leaving your system protected
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Data Protection
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Sandboxie restricts and blocks internet websites and programs from accessing your personal data (i.e. My Documents), files & folders on your system
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It is possible to use Sandboxie after 30 days, it remains functional but display reminders to buy a paid version (shareware).
Alternatives
One alternative way is to use lightweight xubuntu inside Virtualbox. There is possibility to setup “shared folders” to make the file transfer between sandboxed (virtualised) xubuntu and windows easier.