I tried installing several times, and always got this:
Fatal error: Maximum execution time of 30 seconds exceeded in G:\xampp\htdocs\SilverStripe-MySql\framework\thirdparty\zend_translate_railsyaml\library\Translate\Adapter\thirdparty\sfYaml\lib\sfYamlParser.php on line 372

I checked in the sfYamlParser.php on line 372 and it's:
if ($this->currentLineNb >= count($this->lines) - 1)
within the protected function moveToNextLine()

Silverstripe appears to install anyway, (haven't yet played with it), but these fatal errors are unnerving. I see on the forum that their are MANY threads relating to various problems with sfYamlParser.php, although I didn't find a thread of this particular install issue. Perhaps the thirdparty sfYamlParser.php needs replacing???