我正在使用Visual Web Developer Express 2010，Windows XP，并在项目中使用ASP.NET MVC4 RC。 我已安装NuGet v2.0.30619.9119。
我现在正在尝试通过NuGet Package Manager控制台安装MvcScaffolding包。 我遇到了以下错误：
PM> Install-Package MvcScaffolding
Attempting to resolve dependency 'T4Scaffolding'.
Attempting to resolve dependency 'EntityFramework (≥ 4.1.10311.0)'.
You are downloading EntityFramework from Microsoft, the license agreement to which is available at http://go.microsoft.com/fwlink/?LinkId=224682. Check the package for additional dependencies, which may come with their own license agreement(s). Your use of the package and dependencies constitutes your acceptance of their license agreements. If you do not accept the license agreement(s), then delete the relevant components from your device.
Successfully installed 'EntityFramework 4.1.10715.0'.
Successfully installed 'T4Scaffolding 1.0.6'.
File Y:\asp\packages\T4Scaffolding.1.0.6\tools\init.ps1 cannot be loaded. The file Y:\asp\packages\T4Scaffolding.1.0.6\tools\init.ps
1 is not digitally signed. The script will not execute on the system. Please see "get-help about_signing" for more details..
At line:1 char:2
+ & <<<< 'Y:\asp\packages\T4Scaffolding.1.0.6\tools\init.ps1' $__rootPath $__toolsPath $__package $__project
+ CategoryInfo : NotSpecified: (:) [], PSSecurityException
+ FullyQualifiedErrorId : RuntimeException
Successfully installed 'MvcScaffolding 1.0.7'.
File Y:\asp\packages\MvcScaffolding.1.0.7\tools\init.ps1 cannot be loaded. The file Y:\asp\packages\MvcScaffolding.1.0.7\tools\init.
ps1 is not digitally signed. The script will not execute on the system. Please see "get-help about_signing" for more details..
At line:1 char:2
+ & <<<< 'Y:\asp\packages\MvcScaffolding.1.0.7\tools\init.ps1' $__rootPath $__toolsPath $__package $__project
+ CategoryInfo : NotSpecified: (:) [], PSSecurityException
+ FullyQualifiedErrorId : RuntimeException
Successfully added 'EntityFramework 4.1.10715.0' to MyProject.Web.
Successfully added 'T4Scaffolding 1.0.6' to MyProject.Web.
File Y:\asp\packages\T4Scaffolding.1.0.6\tools\install.ps1 cannot be loaded. The file Y:\asp\packages\T4Scaffolding.1.0.6\tools\inst
all.ps1 is not digitally signed. The script will not execute on the system. Please see "get-help about_signing" for more details..
At line:1 char:2
+ & <<<< 'Y:\asp\packages\T4Scaffolding.1.0.6\tools\install.ps1' $__rootPath $__toolsPath $__package $__project
+ CategoryInfo : NotSpecified: (:) [], PSSecurityException
+ FullyQualifiedErrorId : RuntimeException
'InstallationDummyFile.txt' already exists. Skipping...
Successfully added 'MvcScaffolding 1.0.7' to MyProject.Web.
File Y:\asp\packages\MvcScaffolding.1.0.7\tools\install.ps1 cannot be loaded. The file Y:\asp\packages\MvcScaffolding.1.0.7\tools\in
stall.ps1 is not digitally signed. The script will not execute on the system. Please see "get-help about_signing" for more details..
At line:1 char:2
+ & <<<< 'Y:\asp\packages\MvcScaffolding.1.0.7\tools\install.ps1' $__rootPath $__toolsPath $__package $__project
+ CategoryInfo : NotSpecified: (:) [], PSSecurityException
+ FullyQualifiedErrorId : RuntimeException
因为在安装后init脚本没有被执行，所以MvcScaffolding包没有正确安装，
scaffold命令无法识别。我不知道如何处理这些代码签名问题。以下是当前的安全设置：
PM> Get-ExecutionPolicy -List
Scope ExecutionPolicy
----- ---------------
MachinePolicy Undefined
UserPolicy Undefined
Process RemoteSigned
CurrentUser Undefined
LocalMachine Unrestricted
我可以将进程范围更改为无限制吗？如果可以，如何操作？在NuGet控制台运行Set-ExecutionPolicy不起作用：
PM> Set-ExecutionPolicy Unrestricted
Execution Policy Change
The execution policy helps protect you from scripts that you do not trust. Changing the execution policy might expose you to the security risks described in the about_Execution_Policies help topic. Do you want to change the execution policy?
[Y] Yes [N] No [S] Suspend [?] Help (default is "Y"):Y
Set-ExecutionPolicy : Windows PowerShell updated your execution policy successfully, but the setting is overridden by a policy defined at a more specific scope. Due to the override, your shell will
retain its current effective execution policy of "RemoteSigned". Type "Get-ExecutionPolicy -List" to view your execution policy settings. For more information, please see "Get-Help Set-ExecutionPol
icy."
At line:1 char:20
+ Set-ExecutionPolicy <<<< Unrestricted
+ CategoryInfo : PermissionDenied: (:) [Set-ExecutionPolicy], SecurityException
+ FullyQualifiedErrorId : ExecutionPolicyOverride,Microsoft.PowerShell.Commands.SetExecutionPolicyCommand
我也尝试过以管理员身份执行所有操作，但这并没有帮助。
任何建议或想法都将不胜感激。
更新
我可以像这样在NuGet中设置进程执行策略:
Set-ExecutionPolicy Unrestricted -Scope Process
但是，当我重新启动Visual Web Developer时，设置被忘记了，我仍然会收到错误提示，因为它仍然尝试执行init.psl文件。
我如何永久更改执行策略？