Visual Studio 2019 PowerShell主机初始化失败问题求助（常规解决方案无效）

Hey there, let's break down why your existing fixes aren't working and walk through the actual solution to this frustrating issue.

The Root Cause #

Here's the key detail you might have missed: Visual Studio 2019 is a 32-bit application, which means it uses the 32-bit version of PowerShell under the hood. When you ran Set-ExecutionPolicy Unrestricted in a regular PowerShell window, you only modified the policy for the 64-bit environment—your 32-bit PowerShell was still stuck on AllSigned, which is exactly what that start-job command revealed (it runs the command in a 32-bit context).

Step-by-Step Solution #

Follow these steps to fix the 32-bit PowerShell execution policy:

1. Open the 32-bit PowerShell as Administrator:
   Navigate to C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe, right-click it, and select Run as administrator.
2. Set the execution policy for 32-bit PowerShell:
   Run this command in the 32-bit window:

   Set-ExecutionPolicy Unrestricted
   

   When prompted, type Y and press Enter to confirm the change.
3. Verify the change:
   Run Get-ExecutionPolicy in the same window—you should see Unrestricted returned.
4. Restart Visual Studio:
   Close and reopen VS 2019, then try creating your Web Forms project or installing the AWS DynamoDB SDK NuGet package again.

Additional Troubleshooting Tips #

If the above doesn't resolve the issue right away, try these extra steps:

• Manually initialize the Package Manager Console: Open Tools > NuGet Package Manager > Package Manager Console. Sometimes just opening this window triggers the PowerShell host initialization process, which can fix underlying issues.
• Clear NuGet Cache: Go to Tools > Options > NuGet Package Manager > General, then click Clear All NuGet Cache(s). Corrupted cache files can sometimes interfere with package installations.
• Check for Visual Studio Updates: Make sure your VS 2019 is fully updated—Microsoft has released patches for PowerShell host-related bugs in older versions.

内容的提问来源于stack exchange，提问作者AGlasencnik