Is this 3 questions, or 1 related question?
a) Is it possible to install a Windows operating system on a Linux based thin client
b) Is it possible to use a DVD drive to watch DVDs
c) Is it possible to install software using a USB flash drive?
You have three (3) Threads, incredibly similar, posted within 4 weeks, on virtually the same subject.
I may be looking at combining the three under one heading - thin client, to save confusion for people whom are trying to assist you, but only if you confirm whether you have read the Wikipedia link provided you, have a good idea of what you are trying to do, and give us more information on equipment you have or are planning on getting.