I hve a problem... i get this error called "The server threw an exception"

I installed my program in a client pc with the following code:

Dim objWord2 As Object

objWord2 = CreateObject("Word.Application")
objWord2.Visible = True
objWord2.Documents.Open(Environment.CurrentDirectory & "\abc.doc")
'error occurs in the line below
objWord2.ActiveDocument.SaveAs(FileName:="c:\mydoc\03020259-968.doc")

It works in other pc except for one. That pc is running winxp sp2 n office xp.
I reinstall office n still the same
It there another code to save a document?

Thanks in advance