You can download OmniFind for free from
http://omnifind.ibm.yahoo.net/register/form.php
It will meet your requirements.
it's based on nutch
http://lucene.apache.org/nutch/
Omnifind is easy to use and and can be installed by absolutely noobs.
It runs on :
* 32-bit Red Hat Enterprise Linux
Version 5
* 32-bit SUSE Linux Enterprise 10
* 32-bit Windows XP SP2
* 32-bit Windows 2003 Server SP2
/ Petter