ارور پاورشل هنگان نصب دارت

سلام خسته نباشین
من هنگام نصب زبان برنامه نویسی دارت تو پاورل شل ارور پایین رو میده
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Exception setting “SecurityProtocol”: “Cannot convert value “3312” to type “System.Net.SecurityProtocolType” due to inv
alid enumeration values. Specify one of the following enumeration values and try again. The possible enumeration values
are “Ssl3, Tls”.”
At line:1 char:85
+ Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]:: <<<< SecurityProtocol = [System.
Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString(‘https://co
mmunity.chocolatey.org/install.ps1′))
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : PropertyAssignmentException
Exception calling “DownloadString” with “1” argument(s): “The underlying connection was closed: An unexpected error occ
urred on a send.”
At line:1 char:219
+ Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.Se
rvicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString <<<< (‘https://co
mmunity.chocolatey.org/install.ps1′))
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : DotNetMethodException
تمام راه هایی که فک میکنین رو رفتم از جمله تغییر پالیسی که مدل خود پالیسی سیستممBypassهست//**البته پالیسی رو هم تغییر نمیده کلا ارور میده* (ویندوزم ۷ هست)
ممنون میشم راهنماییم کنین