header.jpg is a malicious file, which is mostly installed and used by Malware Doctor virus. Once this malware infects computer, it starts initiating various problems for its victim. For example: this cyber infection can modify system's settings, initiate annoying pop-up ads, display fake system scanners and initiate similar unwanted activities. All alerts that are initiated by Malware Doctor report about invented viruses and computer-related issues. This is done for a very simple reason – this fake security software seeks to convince its victims that their PCs are infected. Also, it wants to make them purchase its fake license. Please, don't do that if you don't want to download another virus on your computer.
header.jpg is mostly used for degrading system's performance, displaying commercial advertisements or performing other annoying actions. However, a really dangerous parasite may use header.jpg for damaging the system, infecting files, affecting installed software and violating people's privacy. If you noticed this file running in your system's background, you should check its trustworthiness and remove it from the system ASAP! For that we recommend using RegCure Pro.