So you haven't had progress in the "Windows-based servers" forum: https://moodle.org/mod/forum/discuss.php?d=213717 ?
There is something wrong in your server, software or hardware. For the kind of load you are talking Moodle should respond in sub-seconds. So it is the usual thing. Describe exactly how you installed, ideally the wiki page or tutorial you followed. How all the parameters set, specially the config.php in Moodle. And hope a Windows expert will volunteer to help you.
This is not Moodle-related: I still believe, getting your wireless driver working in Linux is going to be the only sensible solution for you, since you already have the Linux server going smoothly otherwise.
Hardware and performance
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