Please note that this article was reproduced with permission from Bill Beckelman's website. The original article can be found here. This guide has been used succesfully with Drupal.

Initial Solr Setup

1. Install the latest Java JDK from http://www.oracle.com/technetwork/java/javase/downloads/index.html.
Make sure to select 64bit version if you need it.

title="image" border="0" alt="image" src="/files/solr_windows_installation-1.png"
width="589" height="473">

2. Download Solr 1.4.1 from one of the mirrors at http://www.apache.org/dyn/closer.cgi/lucene/solr/
(at the time of writing, not all mirrors seem to be hosting 1.4.1, but most seem
to have at least 1.4.0)

title="image" border="0" alt="image" src="/files/solr_windows_installation-2.png"
width="566" height="236">

3. Unzip the Solr download. You should have the files listed in the image
below. Open the example folder.