Problem installing pear package manager

I have just installed php5.3.3 and am now trying to install the pear package manager. The pear installation guide tells me to run c:\php\go-pear.bat

When I do this I get this message in command line

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: invalid url or non-existant phar “phar:/go-pear.phar/index.php” in C:\PHP\pear\go-pear.phar on line 1236
Press any key to continue …

Pressing any key simply closes the window.

Can somebody please help with how to proceed.

PHP was installed according to the instructions in the text document attached to the download and configured with pear and appears to work correctly. I have C:\PHP in my system path. I am running windows XP and apache 2.2.16 server