PowerShell scheduled task not converting CSV to EXCEL - powershell

Question

I have a server health check script which i'm trying to get working by scheduled task.
The scheduled task has the following set for 'AddArguments"
Add Arguments: -NoLogo -ExecutionPolicy Bypass -File "C:\HealthCheck.ps1"
Everything in the server health portion of full script works fine to create the .csv report, except the last part, which does the CSV to excel conversion/save/close - I've not included the preceding code as it includes some confidential stuff, and i don't believe it's relevant.
When I run the script with the same ID, but from the GUI (not as a scheduled task) it works fine.
Note: The last part of the script definitely does launch excel briefly and performs the functions, and saves/closes it - i'm thinking the scheduled task isn't doing this because it's not supported by Microsoft?
I did find the following SpiceWorks post but the solution noted didn't resolve the issue for me in this case. That's where you create a DESKTOP folder under these paths depending on your version of Office (i'm using Office 2010 32-bit on Windows 7 x64 Pro)
C:\windows\system32\config\systemprofile
C:\windows\syswow64\config\systemprofile
Anyway, here's the code - Any help appreciated!
#Convert CSV to EXCEL, format, and save
#Create excel object
$xl = new-object -comobject excel.application
$xl.visible = $true
#Input
$Workbook = $xl.workbooks.open(“$Dir\Reports\SeverHealth-Results- $CurrentDate.csv”)
$worksheet = $workbook.worksheets.Item(1)
$xl.Rows.Item("2:2").Select()
$xl.ActiveWindow.FreezePanes = $true
$HeaderRow = $Worksheet.Range("A1:L1")
$HeaderRow.Font.Bold = $True
$HeaderRow.Font.Underline = $True
$range = $worksheet.UsedRange
$range.AutoFilter() | Out-Null
$range.EntireColumn.AutoFit() | Out-Null
$rowc = $WorkSheet.UsedRange.Rows.Count
$colc = $WorkSheet.UsedRange.Columns.Count
#Coloring
for ($z = 1; $z -le $rowc; $z++) {
$ActionReqCol = $worksheet.cells.item($z,7)
$ServerCol= $worksheet.cells.item($z,1)
if ($ActionReqCol.text -eq "YES") {
$ActionReqCol.interior.colorindex=3
$ACtionReqCol.font.colorindex=2
$ServerCol.interior.colorindex=3
$ServerCol.font.colorindex=2}}
#Save and close!
$EndDate = Get-Date
$EndDate = $EndDate.ToString('MM-dd-yyyy_hhmm')
$Worksheets = $Workbooks.worksheets
$xlFixedFormat = [Microsoft.Office.Interop.Excel.XlFileFormat]::xlWorkbookDefault
$Workbook.SaveAs($Dir + "\Reports\SeverHealth-Results-$EndDate.xls”, $XLFixedFormat)
$Workbook.Saved = $True
$xl.Quit()

Answer 1

Write the command to invoke the PowerShell with arguments in a batch file. I believe from the comments that you are already able to do this successfully. Configure the Task Scheduler to execute the batch file.
Other advantage of this is, you have reduced dependency. If later you want to make modifications to your command or alter arguments, then you will be able to do so without altering or even opening the Task Scheduler.
Update: #Kenny reported that running task scheduler's task with highest privilege resolved this. The script required elevated access and the same was provided by checking the check box in Task Scheduler to run the task with highest privilege.