Internal Server Error: Before installation Sugar CRM 6.5.22

Hi all, I am trying to install latest version of sugar crm that is 6.5.22

Following are the steps which I took:

1.Installation Guide Link:
https://support.sugarcrm.com/Documentation/Sugar_Versions/6.5/CE/Installation_and_Upgrade_Guide/index.html
2.Download setup
http://www.sugarcrm.com/download
3.Create "Sugar CRM" project folder in xampp/htdocs
4.Copy and Paste all the files in zip folder to htdocs sugarcrm folder

But when I goto my link that is http://localhost/sugarcrm/  I get an internal server error.

index.php file is not opening from localhost neither is any other file.

Please help.