[Plugin: MailPress] Mailpress on Windows Server causes white screen

Uploaded via FTP and activated via the WP-Admin console.

When I do this, it causes all of WP-Admin to disappear but my site remains functional from the front end.

WP-Admin returns a 500 error.

Anyone found this before?
Anyone found a solution?
Am I supposed to configure anything pre-uploading the plugin?

My server details:
Operating System : WINNT
Server : Microsoft-IIS/7.5
Memory usage : 27.45 MByte
MYSQL Version : 5.1.40-community
SQL Mode : STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
PHP Version : 5.2.11
PHP Safe Mode : Off
PHP Allow URL fopen : On
PHP Memory Limit : 256M
PHP Max Upload Size : 2M
PHP Max Post Size : 8M
PHP Max Script Execute Time : 30s
PHP Exif support : No
PHP IPTC support : Yes
PHP XML support : Yes

Many thanks in advanced.

http://wordpress.org/extend/plugins/mailpress/