Установка $HOME в PowerShell

Как мне изменить свой домашний каталог по умолчанию на "C:Userskhornsby "за каждый раз, когда я открываю powershell?

Я использую Windows 7. Ниже приведена информация о состоянии моего окружения.

Windows PowerShell
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PS P:> cd ~
PS P:> echo $HOME
P:
PS P:> HOME="C:Userskhornsby"
The term 'HOME=C:Userskhornsby' is not recognized as the name of a cmdlet,
function, script file, or operable program. Check the spelling of the name, or
if a path was included, verify that the path is correct and try again.
At line:1 char:25
+ HOME="C:Userskhornsby" 

PS P:> Set-Variable HOME "C:Userskhornsby"
Set-Variable : Cannot overwrite variable HOME because it is read-only or
constant.
At line:1 char:13
+ Set-Variable 

PS P:> dir env:home*

Name                           Value
----                           -----
HOMEPATH                       
HOMEDRIVE                      P:
HOMESHARE                      \fileservkhornsby$


PS P:>