A possible reason that this might happen is that your php include_path is not set correctly. Please make sure you have the appropriate path to PEAR available. For my WAMP installation it would be:
include_path=".;C:wampinphpphp5.3.8PEARPEAR"
However, it will most likely be different on your system.
A side note, you will want to update both your apache php.ini, as well as your php.ini located in your PHP installation folder. CLI the default php.ini, and web requests (and often times other software that you might be using PEAR packages for) will use the apache php.ini.
Hope this helps.
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