Authenticating with PowerShell to Kill Process - powershell

Question

I would like to be able to run this from different workstations which mean we need to authenticate. I have this below but it doesn't seem to work. Can you see anything wrong.
get-content .\killprocess.PS1
$username = 'je\leigh'
$password = cat 'U:\Accounts\Synergy Tools\securestring.txt' | convertto-securestring
$cred = new-object -typename System.Management.Automation.PSCredential `-argumentlist $username, $password
(Get-Content 'U:\Accounts\Synergy Tools\Computers.txt') | ForEach-Object {Get-WmiObject -computer $_ -class win32_process -filter "name='synergy.exe' or name='booking9.exe' or name='acl_apps.exe' or name='pos.exe' or name='booking.exe'" -credential $cred| %{$_.terminate()} | out-null}

Answer 1

If securestring.txt contains a readable password E.g. MyP#ssWord!123. Try using ConvertTo-SecureString's -AsPlainText & -Force parameters:
$password = Get-Content 'U:\...\securestring.txt' | ConvertTo-SecureString -AsPlainText -Force
This will convert the text in securestring.txt into a readable SecureString, which can be viewed with $Password | ConvertFrom-SecureString:
01000000d08c9ddf0115d1118c7a00c04fc297eb010000000a65b1b20fe4e0418aece793d7242358
0000000002000000000003660000c00000001000000082e9a55adb7c90d9bed5946aed69e5380000
000004800000a000000010000000932bccf24879272d36536f6ef98e1be4180000006fb092d673a8
1f84b5954f9cb35daee2addb2d325ec25112140000005c8982b4cd15503000796213c3e0d3869780
Then just give the $password variable straight to -argumentlist $username, $password
If you wanted to you could store the output of ConvertFrom-SecureString into the securestring.txt then use the following in your script:
$password = Get-Content 'U:\...\securestring.txt' | ConvertTo-SecureString
Note: You may get errors if there are more than one line in securestring.txt as it will turn $password an array of strings.