CURL extension needs to be loaded for OpenCart to work!
To install and run OpenCart on my pc curl must be installed/enabled.
When i enable curl extension in Server2go Web Sever , i was able to install OpenCart successfully on my Windows 7 Pc.
For enabling curl , edit server2go/server/config_tpl/php.ini, and change/ uncomment the following line:
;extension=php_curl.dll (you do so by removing the semi-colon)
Restart Web Server and access url like http://127.0.0.1:4001/opencart/