Figure I would chime in. It works fine in Windows 7. I happen to have upgraded to Windows 10 the same week that ACC early Access started. I played it the first two times on my computer with Windows 7.
Since upgrading (same PC just windows 10 now) it does run a little better. I'm not telling you to upgrade but you might benefit from it if you choose to do so at some point in your future.
Specs for those curious (will be changing this soon though) MSI 1080 ti, i7 3770k (4.1ghz oc), 12 gb ram. Everything runs beautifuly on max settings at a good fps, usually between 70-80(with ai) a little more in practice. I got a an average bump of about 5 fps after upgrading to Windows 10.