number of days left on a user's subscription. Version 2006 (13.0) The redesigned main graphical user interface aggregates information in a central user interface. CNET reports the Norton Protection Center, while useful, attempts to advertise additional products. To further facilitate detection of zero-day malware, Bloodhound disassembles a variety of programming languages, and scans code for malicious instructions using predefined algorithms. Internet Explorer homepage hijacking protection was introduced in this release as well; however notably missing is search engine hijacking protection. CNET highlighted Norton AntiVirus 2006's noticeable impact on system performance. Operating system requirements call for Windows 2000 Service Pack 3 or Windows XP. 150 MB of free space and a 300 MHz processor is required under either operating system. 128 MB of RAM is required under Windows 2000, while 256 MB is required in Windows XP. Version 2007 (14.0) Norton AntiVirus was released on September 12, 2006. Symantec revised Norton AntiVirus with the goal of reducing high system resource utilization. Windows Vista compatibility was introduced in this release as well. Despite having about 80% of the code rewritten, CNET reports mixed results in performance testing. Windows 2000 compatibility was dropped from this release. Compatibility with 32-bit versions of Windows Vista was added to this release with a patch from Symantec. Hardware requirements under Vista call for 150 MB free space, an 800 MHz processor and 512 MB RAM. Requirements under Windows XP similarly call for 150 MB free space, a 300 MHz processor, and 256 MB of RAM. Version 2008 (15.0) Norton AntiVirus 2008 was released on August 28, 2007. Emphasizing malware prevention, new features include SONAR, which looks for suspicious application behavior. This release adds real-time exploit protection, preventing attackers from leveraging common browser and application vulnerabilities. When installed in 32-bit versions of Windows XP Service Pack 2, 300 MB of free space, a 300 MHz processor, and 256 MB of RAM is required. When installed in 32-bit and 64-bit versions of Windows Vista, 300 MB of free space, an 800 MHz processor, and 256 MB of RAM is needed. Version 2009 (16.0) Norton AntiVirus 2009 was released on September 8, 2008. Addressing performance issues, over 300 changes were made, with a "zero-impact" goal.Benchmarking conducted by Passmark Software PTY LTD highlights its 47-second install time, 32 second scan time, and 5 MB memory utilization. Symantec funded the benchmark test and provided some scripts used to benchmark each participating antivirus