That's a pretty low rate really considering the user mode malware that exists.
MS recently released its Security Intelligence Report with many findings. The good news is that XP infection rates are down by 20%. The bad news is that Windows 7 infection rates are up by 30%. (For the math challenged, that doesn't mean 30% of all infections shifted over to Windows 7. )
The data, as reported by MSRT which only removes select, but common malware:
Windows 7 32-bit 3 or 4* per 1000 PCs
Windows 7 64-bit 2.5 per 1000 PCs
Windows Vista SP2 6 or 8* per 1000 PCs
Windows XP SP3 18 per 1000 PCs
All versions of Windows combined 9 or 11* per 1000 PCs
*varied throughout the year
Article about the report: http://www.computerworld.com/s/article/9216654/Windows_7_s_malware_infection_rate_climbs_XP_s_falls
The reports: http://www.microsoft.com/security/sir/default.aspx
MS recently released its Security Intelligence Report with many findings. The good news is that XP infection rates are down by 20%. The bad news is that Windows 7 infection rates are up by 30%. (For the math challenged, that doesn't mean 30% of all infections shifted over to Windows 7. )
The data, as reported by MSRT which only removes select, but common malware:
Windows 7 32-bit 3 or 4* per 1000 PCs
Windows 7 64-bit 2.5 per 1000 PCs
Windows Vista SP2 6 or 8* per 1000 PCs
Windows XP SP3 18 per 1000 PCs
All versions of Windows combined 9 or 11* per 1000 PCs
*varied throughout the year
Article about the report: http://www.computerworld.com/s/article/9216654/Windows_7_s_malware_infection_rate_climbs_XP_s_falls
The reports: http://www.microsoft.com/security/sir/default.aspx