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#N88BASIC

Declare Function NtQuerySystemInformation Lib "ntdll.dll" (dwInfoType As DWord,lpStructure As VoidPtr,dwSize As DWord,dwReserved As DWord) As DWord

Type SYSTEM_PERFORMANCE_INFORMATION

	IdleTime As LARGE_INTEGER
	KernelTime As LARGE_INTEGER
	UserTime As LARGE_INTEGER
	Reserved1[2] As LARGE_INTEGER
	Reserved2 As LARGE_INTEGER

End Type

Dim OldSPI As SYSTEM_PERFORMANCE_INFORMATION
Dim SPI As SYSTEM_PERFORMANCE_INFORMATION
Dim OldUserTime As QWord
Dim OldKernelTime As QWord
Dim OldIdleTime As QWord
Dim UserTime As QWord
Dim KernelTime As QWord
Dim IdleTime As QWord
Dim ResultUserTime As QWord
Dim ResultKernelTime As QWord
Dim ResultIdleTime As QWord
Dim ResultSystemTime As QWord
Dim CPUUsage As QWord
Dim Message[256] As Byte

Do

	NtQuerySystemInformation(8,VarPtr(OldSPI),Len(OldSPI),NULL)
	Sleep(1000)
	NtQuerySystemInformation(8,VarPtr(SPI),Len(SPI),NULL)
	memcpy(VarPtr(OldUserTime),VarPtr(OldSPI.UserTime),8)
	memcpy(VarPtr(OldKernelTime),VarPtr(OldSPI.KernelTime),8)
	memcpy(VarPtr(OldIdleTime),VarPtr(OldSPI.IdleTime),8)
	memcpy(VarPtr(UserTime),VarPtr(SPI.UserTime),8)
	memcpy(VarPtr(KernelTime),VarPtr(SPI.KernelTime),8)
	memcpy(VarPtr(IdleTime),VarPtr(SPI.IdleTime),8)
	ResultUserTime=OldUserTime-UserTime
	ResultKernelTime=OldKernelTime-KernelTime
	ResultIdleTime=OldIdleTime-IdleTime
	ResultSystemTime=ResultUserTime+ResultKernelTime
	CPUUsage=(ResultSystemTime-ResultIdleTime)*100/ResultSystemTime
	lstrcpy(Message,"CPU 使用率: ")
	lstrcat(Message,Str$(CPUUsage))
	lstrcat(Message," %")
	SetWindowText(_PromptSys_hWnd,Message)

Loop

1 秒毎に CPU 使用率を取得します。

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[code]
#N88BASIC

Declare Function NtQuerySystemInformation Lib "ntdll.dll" (dwInfoType As DWord,lpStructure As VoidPtr,dwSize As DWord,dwReserved As DWord) As DWord

Type SYSTEM_PERFORMANCE_INFORMATION

IdleTime As LARGE_INTEGER
KernelTime As LARGE_INTEGER
UserTime As LARGE_INTEGER
Reserved1[2] As LARGE_INTEGER
Reserved2 As LARGE_INTEGER

End Type

Dim OldSPI As SYSTEM_PERFORMANCE_INFORMATION
Dim SPI As SYSTEM_PERFORMANCE_INFORMATION
Dim OldUserTime As QWord
Dim OldKernelTime As QWord
Dim OldIdleTime As QWord
Dim UserTime As QWord
Dim KernelTime As QWord
Dim IdleTime As QWord
Dim ResultUserTime As QWord
Dim ResultKernelTime As QWord
Dim ResultIdleTime As QWord
Dim ResultSystemTime As QWord
Dim CPUUsage As QWord
Dim Message[256] As Byte

Do

NtQuerySystemInformation(8,VarPtr(OldSPI),Len(OldSPI),NULL)
Sleep(1000)
NtQuerySystemInformation(8,VarPtr(SPI),Len(SPI),NULL)
memcpy(VarPtr(OldUserTime),VarPtr(OldSPI.UserTime),8)
memcpy(VarPtr(OldKernelTime),VarPtr(OldSPI.KernelTime),8)
memcpy(VarPtr(OldIdleTime),VarPtr(OldSPI.IdleTime),8)
memcpy(VarPtr(UserTime),VarPtr(SPI.UserTime),8)
memcpy(VarPtr(KernelTime),VarPtr(SPI.KernelTime),8)
memcpy(VarPtr(IdleTime),VarPtr(SPI.IdleTime),8)
ResultUserTime=OldUserTime-UserTime
ResultKernelTime=OldKernelTime-KernelTime
ResultIdleTime=OldIdleTime-IdleTime
ResultSystemTime=ResultUserTime+ResultKernelTime
CPUUsage=(ResultSystemTime-ResultIdleTime)*100/ResultSystemTime
lstrcpy(Message,"CPU 使用率: ")
lstrcat(Message,Str$(CPUUsage))
lstrcat(Message," %")
SetWindowText(_PromptSys_hWnd,Message)

Loop

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件名の通り Windows 2000 / XP 用です。
暇があれば 9x 系にも対応したいと思います。