Hey,
this looks quite outdated. The current version of ownCloud seems to be 10.0.9 with an upcoming release of 10.0.10 as announced in ownCloud Server 10.0.10 RC2 is out. I think its recommended to update ASAP to a more recent version.
Have you tried to research what windows wants to tell you with that message? I think this could give you some pointers where to look for this issue.