Preprints are manuscripts made publicly available before they have been submitted for formal peer review and publication. They might contain new research findings or data. Preprints can be a draft or final version of an author's research but must not have been accepted for publication at the time of submission.
This paper reviews writings already done and published on the topic. The Operating systems covered are Windows Vista, Windows XP, Windows 7 Professional and Windows 8. The categories of Vulnerabilities and Threats are discussed with mechanisms implemented and solutions known.