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Does a PC not logged in have protection from its firewall and anti virus protection?
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If the PC is running, and your firewall and AV program are set up properly, then yes, they are protecting your computer, even if not logged in. That said, if your computer has already been compromised, then the firewall may see that activity, coming from a local PC, as legit. So, you need to make sure your system if free of malware, just to be sure. I recommend cleaning out the crud with Windows Disk Cleanup or
ATF Cleaner, then running a supplemental scan with
Malwarebytes's Anti-Malware (MBAM).
The drive activity you see is typical. Remember, Windows is NEVER idle! If you are idle, Windows and other programs you have installed get busy "in the background" - indexing files, backing up email, running scans, checking for updates, etc. So I would not be too concerned with that.
One area that you need to make sure is set up right is your "Trusted Zones" in each PC's firewall settings. You need to make sure only the other computers on your network (everything on your side of the router) are allowed in each computer's trusted zone.
