Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
To get started I need to know, Are you running windows 10 through boot camp, or through parallels, or some other software?
Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.
You may just need to reinstall parralel tools, since you upgraded to windows 10.
Please follow all steps on this page and let me know if that fixes the issue.
You cant run just pure windows on a mac with parralells..
You could use boot camp, so when you start the mac you can choose to always boot into windows.
If you want me to connect and fix parralells and windows 10, I can.
This page will show you how to uninstall parralells and windows
Then, if you want to use just windows, then you must use bootcamp instead.. heres how
Hello again. If you need direct help with those steps, I can connect to your mac from here and do most of them for you.
Let me know if you need further help, and if and when you want to continue.
Not a problem, I hope you enjoy your vacation and I will be here when you return.
Not sure if you used bootcamp or parrallels, but Im glad to hear that you resolved your issue.
How do you want to handle this question, do you want me to send you the refund link? Or did you want to submit a 5 star rating to credit me for my time and assistance? Let me know how you want to close this out when you have time, thank you.
Thank you for responding, please dont click or submit a 5 star rating as that would charge you.
Instead, please use this link to achieve a refund.