Invalid Interval of a Word.Range

[Ghaleon]

HI Guys, I have this line:

Dim Range   As Word.Range
Set Range = Word_Doc.Range(Start:=Word_Doc.Bookmarks("StartText").Range.Start, End:=Word_Doc.Bookmarks("Table").Range.End)

It's working fine on my Virtual Machine with WindowsXP + Office 2007
Also working on my computer with Windows 8 + Office 2013.

But When I tried to run this application on a customer's pc with Windows7 Office 2007

It says something like: Invalid Interval Value

Why it doesn't work ? What could I do ?
how to set the range to the whole document?

[hosting charges]

Which version of VB compiler are you using?

[Ghaleon]

I'm using VisualBasic Version 6