IIS lock-up with DSOFile and ASP

I am using Microsoft's dsofile (http://support.microsoft.com/support.../Q224/3/51.asp) in an ASP to update a set of custom properties in a Word document. The document
properties are always correctly updated after running the script on the ASP. However, after running the ASP for the second or third time IIS will lock and will fail to respond to any request until I restart IIS or get some error (note that the error is not always the same, it can be "internal error"; "trappable error"; "IIS catastrophic failure"; "ASP timeout", ...). I get this behavior on both IIS 5.1 (XP Pro) and IIS 6.0 (2003 Server).

Here is what I am doing on the ASP:

filename = "PATH TO SOME WORD FILE"
set oFilePropReader = CreateObject("D SOleFile.Proper tyReader")
oFilePropReader .UseUnicodeProp Sets = true
set oDocProp = oFilePropReader .GetDocumentPro perties(filenam e)
if not oDocProp.IsRead Only then
oDocProp.Custom Properties.Item ("SOME_PROPERTY ").Value = "something"
end if
set oDocProp = Nothing
set oFilePropReader = Nothing

Please note that even when IIS fails the document properties are always updated, so I guess the problem is not a dsofile internal problem but some problem related to creating/deleting the DSOleFile object on IIS. I have already tried to create the object on global.asa on application start, session start and as an <object>, but IIS continues to lock up after 2 or 3 runs of this page.

Any suggestions from what may be causing this problem?

Thanks, Artur

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