i got this mail from one of my friends and i installed it on win xp, iis 5 and works fine.
1- Download and install ImageMagick-5.5.7-Q16-windows-dll.exe from http://sourceforge.net/project/showfiles.php?group_id=24099 Pay close attention to setting the environment and path variables (see install files)
2- Download php_imagick.dll from
http://php.chregu.tv/php_imagick.dll or http://www.kromann.info/php5.php and place it in your php extensions folder
3- Add the extension to your php.ini file
extension=php_imagick.dll
4- Start/Restart the server
To check if it has loaded, try a phpinfo page <?phpinfo();?>, to check if it is working, there are example files in the Imagick distribution (available from PECL).
I am using Apache, not IIS, but I hope this helps some.