diff --git a/SharePointFunctions.ps1 b/SharePointFunctions.ps1
index 62b310b..5b2f8b0 100644
--- a/SharePointFunctions.ps1
+++ b/SharePointFunctions.ps1
@@ -443,21 +443,29 @@ function Convert-Files {
             $xlsxFileName = $originalFileName -replace "\.xls[m]?$", ".xlsx"
             $xlsxPath = "$env:TEMP\$xlsxFileName"
             try {
-                # Open the Excel file
+                # Open Excel
                 $excel = New-Object -ComObject Excel.Application
-                $excel.Visible = $false  # Keep Excel hidden
-                $workbook = $excel.Workbooks.Open($downloadPath)
-
-                # Save as XLSX
-                $workbook.SaveAs($xlsxPath, 51)  # 51 is the code for XLSX format
-                $workbook.Close()
-                $excel.Quit()
-
-                # Clean up COM objects
-                [System.Runtime.InteropServices.Marshal]::ReleaseComObject($excel) | Out-Null
-                [System.Runtime.InteropServices.Marshal]::ReleaseComObject($workbook) | Out-Null
-                Remove-Variable excel, workbook
-
+                $excel.Visible = $false
+                $excel.DisplayAlerts = $false  # Suppress Excel alerts
+                
+                try {
+                    $workbook = $excel.Workbooks.Open($downloadPath)
+                    
+                    # Save as XLSX
+                    $workbook.SaveAs($xlsxPath, 51)  # 51 = xlOpenXMLWorkbook (*.xlsx)
+                    $workbook.Close($false)
+                }
+                finally {
+                    # Proper cleanup of Excel COM objects
+                    $excel.Quit()
+                    if ($workbook) {
+                        [System.Runtime.Interopservices.Marshal]::ReleaseComObject($workbook) | Out-Null
+                    }
+                    [System.Runtime.Interopservices.Marshal]::ReleaseComObject($excel) | Out-Null
+                    [System.GC]::Collect()
+                    [System.GC]::WaitForPendingFinalizers()
+                }
+                
                 $script:txtStatus.Text += "Successfully converted to: $xlsxFileName`n"
             }
             catch {