PS Scheduling via Windows Task Scheduler

Question

Hi All,
I have been pulling my hair out trying to schedule my APIWSUSCleanup.ps1 file from this thread (http://social.technet.microsoft.com/Forums/en-US/eee88f8a-57de-46db-8d60-efb0e72d57b9/running-5-commands-using-array-elements-and-waiting-between?forum=winserverpowershell)
to run as a scheduled task. Running interactively from a remote PS session the script file runs fine and produces the log file that it should.
I have tried so many different combinations (including nonsensical just to be certain and rule them out) that I'm sure I have started going around in circles, there doesn't seem to be a definitive answer out there so hopefully someone on here can see what
I'm doing wrong for my situation.
I cldn't find any references for WSUS Management Shell cmdlets so I'm assuming that there isn't one that needs to be passed for the script to work like Exchange requires?
Environment: Server 2012 WSUS Core install being administered with Server Manager from a GUI Server 2012 install. Scheduled task being added via Computer Management. I have setup the script
execution using "set-executionpolicy remotesigned" from a Remote Powershell session, assuming that this sets it for x64 and x86? I did see one comment stating that is doesn't.
Task: Run as SYSTEM (have tried local admin account), Run whether logged on or not, Run with highest privileges, Configure for Server 2012, Run on demand enabled.
Task Action:
Program: Have tried
powershell
powershell.exe
%windir%\system32\WindowsPowerShell\v1.0\powershell.exe
%windir%\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
Arguments: Here goes
(The c:\powershell has been substituted by .\ when "start in" populated also as a test and I have also tried the shorthand version of commands such as -c instead of -command)
All of the below have been run prefixed with nothing, -file and then -command (not at the same time)
C:\Powershell\APIMonthlyWSUSCleanup.ps1
"C:\Powershell\APIMonthlyWSUSCleanup.ps1"
("C:\Powershell\APIMonthlyWSUSCleanup.ps1")
{C:\Powershell\APIMonthlyWSUSCleanup.ps1}
"{C:\Powershell\APIMonthlyWSUSCleanup.ps1}"
{"C:\Powershell\APIMonthlyWSUSCleanup.ps1"}
&{C:\Powershell\APIMonthlyWSUSCleanup.ps1}
&"C:\Powershell\APIMonthlyWSUSCleanup.ps1"
&'C:\Powershell\APIMonthlyWSUSCleanup.ps1'
{&"C:\Powershell\APIMonthlyWSUSCleanup.ps1"}
&{"C:\Powershell\APIMonthlyWSUSCleanup.ps1"}
(&"C:\Powershell\APIMonthlyWSUSCleanup.ps1")
(&{C:\Powershell\APIMonthlyWSUSCleanup.ps1})
"&{C:\Powershell\APIMonthlyWSUSCleanup.ps1}"
"& "C:\Powershell\APIMonthlyWSUSCleanup.ps1"
"& 'C:\Powershell\APIMonthlyWSUSCleanup.ps1'"
". 'C:\Powershell\APIMonthlyWSUSCleanup.ps1'"
Start in: Have tried
C:\Powershell\
C:\Powershell
Last Run Result: 0x0 & 0xFFFD0000
History - Action Completed with return: 0, 1, 4294770688 & 2147746132
It would be much appreciated if someone out there can help me to save my sanity.
If there is one command that you think should work please let me know so I can try it and post back the exact result for that command.
FYI - I have also tried to run this using CMD and parsing the powershell.exe in the arguments; I'm not keen on doing it that way though due to the string length limitations for future usage.
Cheers

Answer 1

There was  two ) ) after param ([String]str$))
Here is corrected version (Add line to show the date)
Param ([string]$p) # Parameter for test.ps1
function LogParameter {
param ( [string]$str) Add-Content "C:\PowerShell\Test.Txt" (Get-Date)
Add-Content "C:\Powershell\Test.txt" $str
LogParameter -Str $P # body of test.ps1
I tested with a domain\user with domain admins rights. (Selected Run whether user is logged on or not)
I set the task to run every 5 minutes indefinitely
At the bottom the page of the Settings tab, I selected "Stop the existing instance" from the list.
I checked c:\Powershell\test.txt and it shows it is going every 5 minutes.
In the task manager details page, I can see taskeng.exe running for the doman\user