Drupal requirements

Web Server: Apache 1.3 or Apache 2.x on Unix/Linux of Windows, with Apache 'mod_rewrite' extension

PHP
Prefered: PHP 5.2 or higher
Minimum: PHP version 4.3.5 or higher
PHP memovy of at least 50MB
mysqli
PHP XML extension (is a default)
GD library (is a default)
PHP.ini settings (who differ from default):
* session.save_handler: user
* error_reporting set to E_ALL & ~E_NOTICE.
* In addition, we recommend the following setting: session.cache_limiter: nocache
PHP installes as an Apache module

MySQL
MySQL 4.1 or MySQL 5.0 or higher
The next rights HAVE TO be available for the MySQL user:
SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, INDEX, ALTER, CREATE TEMPORARY TABLES, LOCK TABLES