Running Vista Home Premium 32, Apache 2.2.17, PHP 5.3.5 and MySql 5.5.8, I got a heap of MySql errors at the end of the installation of MODx 1.0.5, similar to those reported by Akymak
in the Russian forum (Windows XP, nginx/0.8.54, PHP 5.3.5 & MySQL 5.5.8 ).
This seems to be down to a bug in the version of MySql that makes it incompatible with PHP 5.3.4+. Replacement with MySql 5.1.54 fixed the problem.

KP