Start here.
Windows Powershell – console
PS C:UsersJohn> $PSHome C:WindowsSystem32WindowsPowerShellv1.0
Windows Powershell (x86) – console
PS E:MSSQLPS> $PSHome C:WindowsSysWOW64WindowsPowerShellv1.0
Other questions:
How to unblock PS1 files e.g. from a Zip file
If you have PS 3.0 + you can use Unblock-File.
If you have PS 2.0 use Andy’s function in Unblocking Files with PowerShell.