According to the changelog, last Magento release (0.6.12510) installation wizard now checks for curl on setup.
Make sure curl extension is enabled in your php.ini
Check the line refering to php_curl.dll uncomment it and restart your web server.
copy the libeay32.dll , ssleay32.dll from the extracted PHP Folder to the path of PHP ex: Program Files/PHP/
and the same with php_curl.dll copy it form from the extracted PHP Folder to the path of PHP ex: Program Files/PHP/ext/
with taking in your concern the previous replay
and restart the apache,
Also, iconv must be loaded too. The system requirements page should include both cURL and iconv. Even though both of those are typically bundled with most PHP installations, it’s still a good idea to add them to the list.
I’ve just installed magento as well on xampp and was getting the same error message, although I followed all instructions
for proper installation. I stumbled on few answers saying to restart the service, the local server, which to my surprise worked!
Surprise, because I have a few different CMS’s running locally on xampp and I never had to do this before running into similiar
Anywayw, just shut down all services and restart. It may work for you as well.