Questions are coming in hot ... will SOLIDWORKS work in Windows 10?
Answer: The moment Service Pack 5.0 of 2015 is released you will have SOLIDWORKS support with Windows 10.
Question: What if I updated Windows already?
Answer: Windows 10 allows you 1 month to rollback to Windows 7 or Windows 8.1. The rollback option will apply and work in 5-10 minutes and you can be back up and working in SOLIDWORKS without any reinstallation!
Question: When will this happen?
Answer: Historically SOLIDWORKS releases Service Pack 5.0 around the last week in October. So we do have some time to wait before October. We also historically see the new version of SOLIDWORKS released sometime in October as well and 2016 comes with full Windows 10 support.
For hardware support, please visit our partners with Computer Integration Technologies, Inc. (CIT). This is important for our subscription customer, because they have some excellent support with CIT through our partnership. We have a great partnership with HP as well and so the hardware configurations you'll see are found here: Hardware Recommendations
At this point my understanding is that Microsoft is supporting Windows 7, Windows 8.1 and the Windows Phone 8.1 for a full year with FREE upgrade status. Visit windows.com for details.
On a side note, SOLIDWORKS 2015 SERVICE PACK 4 is not supported but we do have reports of users using SOLIDWORKS successfully. Some work arounds are needed and some I've heard are using compatibility mode and rolling back a video driver. Again, this is not supported, so be cautious as you move forward. Save and backup your old data first!