Go-pear.bat/go-pear.phar install issues

I've installed PHP5.2.4 on a Server 2k3 IIS6 install. That went smoothly, it runs my PHP files without a problem.

I'm trying to install Horde, now, and that requires the PEAR packages. The problems come in when I try and run go-pear.bat

The errors I get:
C:\PHP>go-pear.bat
phar "C:\PHP\PEAR\go-pear.phar" does not have a signature PHP Warning: require_once(phar://go-pear.phar/index.php): failed to open stream: phar error: "index.php" is not a file in phar "go-pear.phar" in C:\PHP\PEAR\go-pear.phar on line 1237

PHP Fatal Error: require_once(): Failed opening required 'phar://go-pear.phar/index.php' (include_path='.;C:\php5\pear') in C:\PHP\PEAR\go-pear.phar on line 1237


Help pleeeeeeeeeeease.

Thanks so much in advance.