The methods discussed so far concern web browser installation. However, in certain, very rare instances, it may be difficult to perform a browser installation. This problem can be solved by the manual process, in which you will need to open up some system files and change the variables by yourself. It is a difficult process and it is quite easy to get it wrong. Some detail of how to go ahead with this method can be found at http://help.joomla.org/content/view/1944/302/.
For other common installation issues and errors, and how to resolve them, please refer to http://help.joomla.org/content/view/1945/302/.