Closing of word process in the server using VB.NET

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VB

Microsoft

I got some codes here which is generating a word file. It is working fine in my local host and in the test server. The winword.exe is properly closing and releasing the memory. However, upon testing it to the another server, the winword.exe still remain in background process and memory is not released even after the generation.
I monitored the CPU usage of the server and it's not even high and goes back to 0% after word file generation but the winword.exe remains in background.
I am new to this. Please help. Thanks!

What I have tried:

Public Sub Generate_Word(ByVal strResult As List(Of String))
Dim strTemplateFile As String = "~\TestFolder\TestFile.doc"
Dim WordApp As New Word.Application
Dim newDoc As Word.Document
newDoc = WordApp.Documents.Add(HttpContext.Current.Server.MapPath(strTemplateFile))

'*** Generate word file here ***'

'*** Save the file here***'

ReleaseObject(rng)
newDoc.Close(False)
ReleaseObject(newDoc)

WordApp.Application.Quit(False)
ReleaseObject(WordApp)

'*********** Start of clean up code *************'
GC.Collect()
GC.WaitForPendingFinalizers()

'GC needs to be called twice in order to get the Finalizers called
'the first time in, it simply makes a list of what is to be
'finalized, the second time in, it actually is finalizing. Only
'then will the object do its automatic ReleaseComObject.

GC.Collect()
GC.WaitForPendingFinalizers()
'*********** End of clean up code *************'

'*** save the file to database here ***'
End Sub

Public Sub ReleaseObject(ByVal obj As Object)
Try
Dim intRel As Integer = 0
Do
intRel = System.Runtime.InteropServices.Marshal.FinalReleaseComObject(obj)
Loop While intRel > 0
obj = Nothing
Catch ex As Exception
obj = Nothing
Finally

End Try
End Sub