We only install genuine Microsoft Operation system. You will receive the Microsoft license code attached to your computer. Be aware of distributers that "put" the license on for free. Microsoft does not have a free Operation System.
We can install linux on your system where there is no purchase cost, but we do not support it at this time and you will be on your own for any issues
There is lots of good free software out there. Be advised that many of the free software also installs other unwanted programs. Read the EULA agreement to see if you are willing to have the additional software installed.