diff --git a/scripts/e2e/parallels/plugin-isolation.ts b/scripts/e2e/parallels/plugin-isolation.ts
index d2642d3f699..bb96f50aed7 100644
--- a/scripts/e2e/parallels/plugin-isolation.ts
+++ b/scripts/e2e/parallels/plugin-isolation.ts
@@ -109,14 +109,17 @@ export function windowsProviderOnlyPluginIsolationScript(options: PluginIsolatio
   return `$env:OPENCLAW_PARALLELS_PLUGIN_ISOLATION = @'
 ${payloadJson}
 '@
-$isolationScriptPath = Join-Path ([System.IO.Path]::GetTempPath()) 'openclaw-parallels-plugin-isolation.cjs'
+$isolationScriptPath = Join-Path ([System.IO.Path]::GetTempPath()) ('openclaw-parallels-plugin-isolation-' + [guid]::NewGuid().ToString('N') + '.cjs')
+try {
 @'
 ${providerOnlyPluginIsolationNodeSource()}
 '@ | Set-Content -Path $isolationScriptPath -Encoding UTF8
 node.exe $isolationScriptPath
 if ($LASTEXITCODE -ne 0) { throw "plugin isolation failed with exit code $LASTEXITCODE" }
-Remove-Item $isolationScriptPath -Force -ErrorAction SilentlyContinue
-Remove-Item Env:OPENCLAW_PARALLELS_PLUGIN_ISOLATION -Force -ErrorAction SilentlyContinue`;
+} finally {
+  Remove-Item $isolationScriptPath -Force -ErrorAction SilentlyContinue
+  Remove-Item Env:OPENCLAW_PARALLELS_PLUGIN_ISOLATION -Force -ErrorAction SilentlyContinue
+}`;
 }
 
 function providerOnlyPluginIsolationNodeScript(options: PluginIsolationOptions): string {
diff --git a/test/scripts/parallels-smoke-model.test.ts b/test/scripts/parallels-smoke-model.test.ts
index d272ce7e6d3..539728de073 100644
--- a/test/scripts/parallels-smoke-model.test.ts
+++ b/test/scripts/parallels-smoke-model.test.ts
@@ -58,6 +58,7 @@ import { testing as packageArtifactTesting } from "../../scripts/e2e/parallels/p
 import { PhaseRunner } from "../../scripts/e2e/parallels/phase-runner.ts";
 import {
   posixCodexPlatformPackageRepairFunction,
+  windowsProviderOnlyPluginIsolationScript,
   windowsCodexPlatformPackageRepairFunction,
 } from "../../scripts/e2e/parallels/plugin-isolation.ts";
 import { parseArgs as parseWindowsSmokeArgs } from "../../scripts/e2e/parallels/windows-smoke.ts";
@@ -407,6 +408,21 @@ describe("Parallels smoke model selection", () => {
     expect(windowsRepair).toContain("Repair-MissingCodexPlatformPackage");
   });
 
+  it("keeps Windows provider-only plugin isolation temp scripts per run", () => {
+    const script = windowsProviderOnlyPluginIsolationScript({
+      fallbackPluginId: "openai",
+      modelId: "openai/gpt-5.5",
+    });
+
+    expect(script).toContain("[guid]::NewGuid().ToString('N')");
+    expect(script).toContain("openclaw-parallels-plugin-isolation-");
+    expect(script).not.toContain("'openclaw-parallels-plugin-isolation.cjs'");
+    expect(script).toContain("try {");
+    expect(script).toContain("} finally {");
+    expect(script).toContain("Remove-Item $isolationScriptPath -Force -ErrorAction SilentlyContinue");
+    expect(script).toContain("Remove-Item Env:OPENCLAW_PARALLELS_PLUGIN_ISOLATION");
+  });
+
   it("writes full model ids as config map keys in provider batches", () => {
     const batch = JSON.parse(modelProviderConfigBatchJson("openai/gpt-5.5", "windows")) as Array<{
       path: string;