Contradicting to answer given above and your statement I would like to say that Windows 10 is not that dangerous. I agree that there are multiple compatibility issues in Windows 10 but it is not the case that you cant use it or you cant find solution for it. Windows 10 is the next stable operating system after Windows 7 where you can easily find a solution for any problem. If you are sure that your wifi was working properly before upgrade to windows 10, you can try out few things. If you are not sure if Wifi was working even before upgrade then you will have to check if the setting are correct in your router. Below are some of the steps/solutions that you can try for problem specific to your case:
1) Go to network and adapter settings and disable your Wifi adapter and enable it again.
2) Go to Wifi properties and go to TCP/IPv4 properties. First try with Obtain IP address automatically. If it is not working, then update the IP address and validate it upon exit. This will mostly solve your problem.
If you still have issues with your connection, check the router settings. You can also take the router to your service provider to get the issue sorted.