A. A. Vista's new Windows System Assessment Tool (WinSAT) performance scores have a Windows Management Instrumentation (WMI) class--Win32_WinSAT--which retrieves the WinSAT scores. The following script, which you download at http://www.windowsitpro.com/content/content/94815/winsat.zip , shows the code to use to get the performance scores:

strComputer = "."
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")
Set colItems = objWMIService.ExecQuery("Select * From Win32_WinSAT")
For Each objItem in colItems
Wscript.Echo "Processor: " & objItem.CPUScore
Wscript.Echo "Memory: " & objItem.MemoryScore
Wscript.Echo "Primary hard disk: " & objItem.DiskScore
Wscript.Echo "Graphics: " & objItem.GraphicsScore
Wscript.Echo "Gaming graphics: " & objItem.D3Dscore
Wscript.Echo "Windows System Performance Rating: " & objItem.WinSPRLevel
The following command starts the script:

D:\temp>cscript winsatscore.vbs

and produces this output on my machine:

Processor: 4.7
Memory: 4.9
Primary hard disk: 5
Graphics: 3.3
Gaming graphics: 3
Windows System Performance Rating: 3