3
ok
a few assumptions first
you have extracted the contents of the XOOPS archive onto your server.
You have created a MySQL datbase and user, and assigned that user to the respective database
you have navigated to
http://www.yoursite.comyou have followed the instruction in the installation; including chmod'n template_c, uploads, cache, and mainfile.php 777
You have completed the installation being dure to give the proper information when required
localhost
yourprefix_user
pass
yourprefix_database
If you followed these assumption you should have no issues.