Yikes -- *why* did you switch to a windows server? eek
The details in your /includes/configure.php file and likely also the /admin/includes/configure.php file are not correct for your new server.
Please post the contents of those files ... without the database password.
FAQs on switching servers
https://www.zen-cart.com/tutorials/index.php?article=99
http://www.zen-cart.com/wiki/index.p...Switch_Servers




