I suppose you get this at starup. msconfig --> disable any office startup/services. might be crapware also, so run an AV scan, try ewido.net online scanner, or if you have a scanner run it.
did your try to got to www.ewido.net and click on the online scan, I'm thinking it maybe a form of malware, even though a quick google shows it is a legit ms dll. can never be to sure!
now you said it only happens when you open a folder. is that any folder? or an office document?
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