Concrete5 installation on Plesk not working properly

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I installed concrete5 on a subdirectory of our site and the installation was ok. The only problem though is that I cannot accesshttp://www.sitename.com/ems/ but I can access
http://www.sitename.com/ems/index.php.... Also creating other pages would also automatically convert all pages to pretty urls thus the problem occurs since it will not work and will lead to a broken page. I hope anyone could help me with this since I have this problem almost two week now. I also read some discussion regarding a possible solution but nothing seems to work.

Thanks.