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我在项目中使用Visual Web Developer Express 2010，Windows XP和使用ASP.NET MVC4 RC。我已经安装了NuGet v2.0.30619.9119。安装MvcScaffolding包时NuGet执行策略错误
我现在试图通过NuGet程序包管理器控制台安装MvcScaffolding软件包。我收到以下错误：
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init脚本没有被安装，该MvcScaffolding包未正确安装和scaffold命令不被识别后执行。
我不知道该怎么办这些代码签名问题。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？如果是这样，怎么样？在控制台的NuGet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
我也试着做这一切作为管理员，但这并没有帮助的。
任何意见或想法将不胜感激。
UPDATE
我可以将进程执行政策的NuGet这样的：
Set-ExecutionPolicy Unrestricted -Scope Process
但是，当我重新启动Visual Web Developer中，设置被遗忘，我仍然得到一个错误，因为它一直试图执行init.psl文件
如何永久更改执行策略？