Do you use IIS? In this case, use Helicon Ape to manage .htaccess instead of web.config files. If you use XAMPP make sure you have .htaccess in the correct folders.
For second error; Most likely curl support is not enabled.
You can check by creating a .php file with a phpinfo(); function in it. Browse to this and search/look for curl on the resulting page. If support is enabled, there will be a listing for it.
im using XAMMP . Like what folders should have the .htaccess file in there?? im Kinda New to using RevCMS and kinda confused about that php thing too.. sorry