cURL Installation on Win 7 IIS

Your PHP Version number matters.  You can use phpinfo() to find this.

Here is what PHP.net has to say.
http://php.net/manual/en/book.curl.php

Check the version number:
http://php.net/manual/en/curl.requirements.php

Check the path to the libraries:
http://php.net/manual/en/curl.installation.php

Check the configuration options:
http://php.net/manual/en/curl.configuration.php

Try making a simple test to see if cURL is installed before you get into the Twitter Oauth.  You just want a "Hello World" example first!

I have been using some of the reverences you mention above, but I am very confused as to exactly what version of cURL, which one to download, where to put the contents, and what to configure.

My PHP version is 5.4.16

I need a real idiot guide for this because I have been trying now for 8 hours with varying downloads and documentation and I cannot get this working. Most of the documentation is a lilt 'presumptive' to say the least.

Yeah, I get it.  I have the luxury of "server support" to handle all of this configuration stuff for me!

PHP 5.0.0 requires a libcurl version 7.10.5 or greater  So it seems that 5.4.16, which is pretty up-to-date, would use the most current version.  The yellow-colored links are the most current on this page (find Win near the bottom):
http://curl.haxx.se/download.html

I'll ask a moderator to add this to the PHP for Windows Zone.  Maybe get some fresh eyes on the problem...