Installing eAccelerator
Downloading
You can get my pre-compiled eAccelerator from here.
Installing
Drop the downloaded file under C:\XAMPP\php\ext\ and replace the existing one
Go back to your php.ini, search for eAccelerator and uncomment this line:
zend_extension = "C:\xampp\php\ext\eaccelerator.dll"
eAccelerator is now installed!