EDIT: I wrote this question in a misleading way. I should clarify that while I am on SharePoint Server 2010, I have admin rights on a SharePoint site. I do not have Foundation or Server apps.
I was having a similar problem as the link below, except I am using Windows PowerShell to install the Microsoft.SharePoint.Powershell.dll file. When I attempted the fix, I got this message in PowerShell:
"System.IO.FileNotFoundException: Could not load file or assembly 'file:///C:\Windows\Microsoft.NET\assembly\GAC_MSIL\Microsoft.SharePoint.PowerShell\v4.0_126.96.36.199_71e9bce111e9429c\Microsoft.SharePoint.PowerShell.dll' or one of its dependencies. The system cannot find the file specified."
How else can I get Microsoft.SharePoint.PowerShell.dll?