Malicious software infection rates
Windows XP RTM33.6
Windows XP SP125.2
Windows XP SP212.9
Windows XP SP36.5
Windows Vista RTM3.7
Windows Vista SP12.6
Windows Vista RTM (64-bit)3.0
Windows Vista SP1 (64-bit)2.5
Windows 2000 SP43.8
Windows Server 2003 SP22.7
Windows Server 2008 RTM1.3
Windows Server 2008 RTM (64-bit)0.6