Microsoft`s own free Anti-Virus Released (Full Version)
Microsoft Security Essentials
Microsoft Security Essentials (MSE) (previously codenamed Morro) is an antivirus software created by Microsoft that provides protection against viruses, spyware, rootkits, and trojans for Windows XP, Windows Vista, and Windows 7, free of charge. MSE replaces Windows Live OneCare, a commercial subscription-based antivirus service and Windows Defender, which only protects users from adware and spyware. It is geared for home use, unlike Microsoft's upcoming enterprise-oriented product Microsoft Forefront.
Symantec and McAfee, two competing antivirus vendors, responded by claiming that MSE is not comparable with their own offerings. AVG Technologies viewed MSE positively, stating it reinforced the company's ideal of free antivirus software. Reviews were mostly positive, citing its organized interface, low resource usage, and the fact that it is free.