It runs fine on my win10 rig. What are your system specs on your win7?

I run this game since release on Win7 x64 with i7 4.0 GHZ, 4GB VRAM GTX 960, 16 GB RAM.
What you need to do in Win7 is: you need to update the TLS http protocol to 1.1/1.2, otherwise you get long delays when warping, teleporting or other loading screens, also your connection may fail. No other problems to report.

Have zero problems with Win10x64, and the latest official build, v1903, build 18362.175, is the best version of Windows I've ever played games on, frankly. Progress must go on, and Win10x64 supports newer hardware standards much better than W7 ever did--I ran W7x64 and when it shipped it was by far the best OS Microsoft had ever shipped, but I have to in all honesty say that as far backwards game compatibility goes even with Win32 games that even Win8x64 (which I also used prior to taking Microsoft's free update to Win10x64 Pro in late 2014--been free ever since!) was superior to Win7x64. But no question that Win10x64 tops 'em all, imo, hands down. Win10x64 is what Win8x64 should have been...;)

I still have a difficult time realizing that there were people who could have availed themselves of a free copy of Win10x64--good for life if you upgraded from a retail copy of Win7 or Win8! (OEM copies of W7 would upgrade to an OEM copy of Win10x64, which follows the hardware, so when your mboard retires so does your free Win10x64 license--but..if you upgraded from a retail version of Win7/8x64 then you got a free license to Win10x64 retail--which doesn't follow the hardware but follows the customer!--through his lifetime of upgrades, or until Win10x64 is replaced by something else entirely--which I don't see happening for many years! Has to be the best OS deal I've ever been offered from any source! Anyway...with deals like that it's difficult to say that Microsoft is "corralling" anyone...;)

ignoring the usual "Win10 is great" shills ( i have acces to Win 10 on one laptop - it is not "great" by any means), you should have no issue running the game on Win7. I seem to remember at one point it stopped working for me, but that ended up being down to NMS now requireing an updated version of OpenGL (iirc) and that required an updated .NET version from MS or some such.

So if the game had been working fine for you previously on your Win7 rig check the specs for any particular update and see if you meet them.

I plan on using Win7 for gaming from here on out, then again i rarely game (or connect!) online for that, but if you do you face having to upgrade come january.

You could try searching the internet for threads such as this:

https://www.reddit.com/r/NoMansSkyTheGame/comments/4xene1/pc_crash_thread/

Just in case you come across an answer.