someone said:
Windows 7 has Microsoft Security Essentials which is an antivirus and
security applet with high ratings. You can download that to any PC.
This is not true. Microsoft Security Essential is an antivirus/antimalware
program but it is *not* part of Windows 7. Windows Defender, which is
strictly an antimalware program and *not* an antivirus, is part of Windows 7
just like it is part of Windows Vista.
A Windows 7 machine needs an antivirus installed, just like all other
Microsoft operating systems.
Malke