diff --git a/extensions/copilot/src/extension/chatSessions/vscode-node/copilotCLIShim.ps1 b/extensions/copilot/src/extension/chatSessions/vscode-node/copilotCLIShim.ps1
index dd0a9f68e25..d109294c208 100644
--- a/extensions/copilot/src/extension/chatSessions/vscode-node/copilotCLIShim.ps1
+++ b/extensions/copilot/src/extension/chatSessions/vscode-node/copilotCLIShim.ps1
@@ -14,6 +14,23 @@
 
 # Minimum required Copilot CLI version
 $RequiredVersion = "0.0.342"
+$PackageName = "@github/copilot"
+
+function Invoke-NpmGlobalCommand {
+    param(
+        [Parameter(Mandatory = $true)][ValidateSet('install', 'update')][string]$Command,
+        [Parameter(Mandatory = $true)][string]$Package
+    )
+
+    $npmArgs = @($Command, '-g', $Package)
+
+    $npmCmd = Get-Command npm.cmd -ErrorAction SilentlyContinue
+    if ($npmCmd) {
+        & npm.cmd @npmArgs
+    } else {
+        & npm @npmArgs
+    }
+}
 
 function Find-RealCopilot {
     # Find the real copilot binary, avoiding this script if it's in PATH
@@ -73,7 +90,7 @@ function Test-AndLaunchCopilot {
         $answer = Read-Host "Install GitHub Copilot CLI? (y/N)"
         if ($answer -eq "y" -or $answer -eq "Y") {
             try {
-                & npm install -g @github/copilot
+                Invoke-NpmGlobalCommand -Command 'install' -Package $PackageName
                 if ($LASTEXITCODE -eq 0) {
                     Test-AndLaunchCopilot $Arguments
                     return
@@ -98,7 +115,7 @@ function Test-AndLaunchCopilot {
         if ($answer -eq "y" -or $answer -eq "Y") {
             Write-Host "Reinstalling GitHub Copilot CLI..."
             try {
-                & npm install -g @github/copilot
+                Invoke-NpmGlobalCommand -Command 'install' -Package $PackageName
                 if ($LASTEXITCODE -eq 0) {
                     Test-AndLaunchCopilot $Arguments
                     return
@@ -125,7 +142,7 @@ function Test-AndLaunchCopilot {
         $answer = Read-Host "Would you like to reinstall GitHub Copilot CLI? (y/N)"
         if ($answer -eq "y" -or $answer -eq "Y") {
             try {
-                & npm install -g @github/copilot
+                Invoke-NpmGlobalCommand -Command 'install' -Package $PackageName
                 if ($LASTEXITCODE -eq 0) {
                     Test-AndLaunchCopilot $Arguments
                     return
@@ -159,7 +176,7 @@ function Test-AndLaunchCopilot {
         $answer = Read-Host "Reinstall GitHub Copilot CLI? (y/N)"
         if ($answer -eq "y" -or $answer -eq "Y") {
             try {
-                & npm install -g @github/copilot
+                Invoke-NpmGlobalCommand -Command 'install' -Package $PackageName
                 if ($LASTEXITCODE -eq 0) {
                     Test-AndLaunchCopilot $Arguments
                     return
@@ -182,7 +199,7 @@ function Test-AndLaunchCopilot {
         $answer = Read-Host "Update GitHub Copilot CLI? (y/N)"
         if ($answer -eq "y" -or $answer -eq "Y") {
             try {
-                & npm update -g @github/copilot
+                Invoke-NpmGlobalCommand -Command 'update' -Package $PackageName
                 if ($LASTEXITCODE -eq 0) {
                     Test-AndLaunchCopilot $Arguments
                     return