I've applied these patches consecutively to Magento using CygWin:
After doing so, I try to clear my system cache as the instructions say but I can't access my front and back ends. I get a blank page.
I enable the error_reporting on index.php and I see this error:
Fatal error: Class 'Varien_Db_Adapter_Pdo_Mysql' not found in C:\xampp\htdocs\magento\lib\Magento\Db\Adapter\Pdo\Mysql.php on line 35
How do I fix?