Here is what to do:ġ.Open the Start menu and select Settings. The truth is that as long as you have upgraded for more than 1 month, you can remove Windows 10 and go back to previous build on your Dell computer. To extend Windows 10 user base numbers, Microsoft offers free upgrade for those using Windows 7 or Windows 8.1, but not everyone is satisfied with the flagship OS and a certain number of users want to downgrade Windows 10 back to Windows 7. Way 1: Go back to Windows 7 from Windows 10 after 30 Day