unblocking pictures

We are working in a homegroup of 5 comps. My problem is all of a sudden pictures i am receiving from 1 computer downstairs are all blocked for my safety because they have come from another computer. I have to individually click properties on each pic and unblock them 1 at a time. The 2 comps concerned are both running windows 7 professional, and we are all shared. The transfer is fine, it just won't let me open them for editing
. Everthing was fine a fortnight ago. Feel sure there must be a tick missing in some settings somewhere just can't seem to find it

Many thanks for any help given.

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