Monitor System Performance with PowerShell

$cpuUsage = Get-WmiObject -Class Win32_Processor | Measure-Object -Property LoadPercentage -Average | Select-Object -ExpandProperty Average
$memInfo = Get-WmiObject -Class Win32_OperatingSystem
$totalMemory = $memInfo.TotalVisibleMemorySize
$freeMemory = $memInfo.FreePhysicalMemory
$usedMemory = $totalMemory - ($freeMemory * 1MB)
$memoryUsagePercentage = [math]::round(($usedMemory / $totalMemory) * 100, 2)

$performanceReport = @{
    'CPU Usage (%)' = $cpuUsage
    'Used Memory (MB)' = [math]::round($usedMemory / 1MB, 2)
    'Free Memory (MB)' = [math]::round($freeMemory / 1MB, 2)
    'Memory Usage (%)' = $memoryUsagePercentage
}
$performanceReport.GetEnumerator() | ForEach-Object {
    Write-Host "$($_.Key): $($_.Value)"
}

$logFilePath = "C:\Path\To\Your\PerformanceLog.txt"
$dateTime = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
$logEntry = "$dateTime - CPU Usage: $cpuUsage%, Memory Usage: $memoryUsagePercentage%"
Add-Content -Path $logFilePath -Value $logEntry

if ($cpuUsage -gt 80 -or $memoryUsagePercentage -gt 80) {
    [System.Windows.MessageBox]::Show("ALERT: High System Resource Usage! Review performance metrics.", "Performance Notification", 0, [System.Windows.MessageBoxIcon]::Warning)
}

# This step typically involves using Task Scheduler within Windows, so no specific PowerShell code is provided here.