Thesis statement Anything which brings comfort and pleasure also brings some consequences with it. Those consequences are very difficult to handle at the same time to quit that pleasure and comfort is also next to impossible. The security threats on a personal computer can be of three types The theft of soft copies like, software, information and other secure data. The next security threat can be of viruses, worms and malwares and the loss of data. The next can be the theft of the loss of hardware. Hardware is the outer part of a computer and is the least concern in terms of security threat. But information, files, software etc are very important things and the highest concern in terms of security of the systems or personal computers in any organization. Organizations which only deal in information and are very insecure in terms of the same are very concerned about the security of the system. Now a days people deliberately try to disturb you and they hack your system or make viruses and other destructing things which can harm the hidden documents of your PC. Some of the techniques an attacker might employ to access information on the system are