For some reason, I couldn’t get XAMPP 1.7.0 working in Windows 7. There appears to be some sort of issues. I tried the zip package or the 7z package and both have the same result. Instead I found XAMPP 1.6.8 to be working fine for Windows 7 and is using that for web development using PHP and MySQL. I can confirm that cURL and sendmail is working fine in the Windows 7 environment with XAMPP 1.6.8.