This malware is looking for the OS version (XP, Vista, Seven) and changes its name and skin: XP Anti-Spyware, XP Home Security 2013, XP Anti-Virus 2013, XP Security 2013 (...). It belongs to the Braviax/FakeRean family. As usual it displays fake warning messages to push users into buying a license.
The rogue is closing legit software. You can register by entering the following serial code 3425-814615-3990 (manual registration).
Edit 14 Nov. 2011:
Serial code was updated: 1089-903874-1875