In an installation time moodle there is a following message
Notice: Undefined property: stdClass::$release in C:\Moodle_2_0_Windows\server\moodle\lib\environmentlib.php on line 528
php_extension zip must be installed and enabled
The Zip PHP extension is now required by Moodle, info-ZIP binaries or PclZip library are not used anymore.
after that installation stops