Windows XP was launched in 2001 without an active firewall or integrated antivirus, exposing users to malware. The Internet Connection Firewall was included but not enabled by default, and it wasn't activated until Service Pack 2 was released nearly three years later. Microsoft introduced its antivirus solution, Microsoft Security Essentials, in 2009. Internet Explorer 6, included with Windows XP, had significant security vulnerabilities, allowing malware to easily infiltrate systems. The transition from Windows 95/98 to NT caused driver compatibility issues, leading to troubleshooting challenges for users. Network sharing features were unreliable, with many users experiencing difficulties connecting multiple XP PCs and sharing printers. Windows XP reached its refined state with Service Pack 3 in 2008 and ended mainstream support in 2014. Despite this, it continues to be used in some modern applications, such as self-checkout registers.