* By design, the system tray icon for Windows Defender does not appear if you do not need to take action.
* Windows Defender might prompt you to remove some peer-to-peer (P2P) file-sharing programs. If you choose to remove such a program, Windows Defender deletes all the contents of the Program Files folder associated with the P2P program. Because some P2P programs store downloaded files in a default folder under Program Files, this might remove all files you have downloaded through the file-sharing program. For example, KaZaA stores .exe and .dll files at C

rogram FilesKazaa. Downloaded files are stored at C

rogram FilesKazaaMy Shared Folder. If you use Windows Defender to remove KaZaA, all files and folders under C

rogram FilesKazaa are removed. If you have installed any P2P file-sharing programs, it is a good idea to back up your downloaded files before you run Windows Defender.
* You do not need to remove other antispyware or antivirus programs to run Windows Defender. Other programs or Windows Defender might prompt you to allow or block an action, but there are no other known incompatibilities between Windows Defender and other antispyware or antivirus programs.
* By design, the final release of Windows Defender removes Windows Defender (Beta 2).
* Windows Defender offers only limited Group Policy settings. The final version of Windows Defender will include administrator (.adm) files so that you can configure those limited settings in Windows Defender through Group Policy.