Hi,
Unfortunately it is not possible to change the burn speed with the built in functionality of Windows. You may try alternative third party softwares for this.
Note:
Using Third Party Software, including hardware drivers can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the use of Third Party Software can be solved. Using Third Party Software is at your own risk.
We appreciate your feedback and use it to help create better services and products. You can post your feedback to us on the link provided below.
http://mymfe.microsoft.com/Windows%20%207/Feedback.aspx?formID=195