Thankfully Microsoft have now added a feature to their Operating System to allow you to burn ISO files without needing any extra software.
To do this, simply Double Click an ISO file
you have on your computer and it should start up the ISO burning software, if it doesn't (because you've assigned ISO files to open with something else) then you may need to right click the ISO file
and then select Open With >> Windows Disc Image Burner
You should then see something that looks like the following:
It's minimalistic but it gets the job done if you don't need any special settings or features.