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This dissertation was written as a part of the MSc in Information and Communication Technology (ICT) Systems at the International Hellenic University. The topic of this dissertation is "Computer Forensics on Financial Crimes". The financial crime examined here is the Enron scandal, which is considered to be one of the most complex financial crimes in the history of corporate fraud. In order to examine this white-collar crime, the publicly available Enron corpus was used. Enron corpus includes emails exchanged by Enron's employees and it was used as a vehicle so that a computer forensics methodology would be created. Specifically, Enron email dataset was processed in order to provide useful statistical analysis results. Furthermore, Enron email dataset was analyzed so that social network visualization of it would be generated. Hence, by analyzing Enron corpus, this dissertation aims to act as a computer forensics toolkit for further analysis that can be conducted on this subject in the future and for financial crimes in general. I would like to thank my supervisor, Prof. Vasilios Katos, for his valuable guidance and support throughout my thesis process. It was a privilege to have the opportunity to work with such a devoted scientist and inspiring teacher, who always provided me with significantly helpful advice. Additionally, I would like to express my gratitude to my wonderful family for their emotional and financial support throughout my studies and in my life in general. Finally, I would like to thank my amazing friends for their constant encouragement and belief in me.