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Other thoughts:
What OSes are you running? Are they all uptodate, patched etc?
You mentioned an "HTPC" - what is that, and what does it run?
Do you have any NAS (network addressable storage) devices? Most of those run some flavour of linux, I think.
Do you have any network-attached security cameras, or anything else whose OS almost certainly never gets patched?
Have you ever allowed anyone to access any of your machines remotely, using RDP or something like TeamViewer? If you did, did you uninstall / turn off the feature afterwards?
Do you ever run other OSes in VMs (ie Virtual Machines), without properly/fully configuring those to make them secure?
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