Did you read the Performance docs http://docs.moodle.org/en/Performance ?
and the Installation docs http://docs.moodle.org/en/Installing_Moodle ?
Related discussions in this forum, for example, http://moodle.org/mod/forum/discuss.php?d=138760 ?
You can search the forum for keywords by entering them in the field top right.
Since you are running MS Windows, have a look at the Windows-based servers http://moodle.org/mod/forum/view.php?id=6799