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#21
thanks sygnus21, if you read posts #13 and 19 you'll see that I have already uninstalled and reinstalled, both without and with the cleaning tool - with no amelioration
and Acrobat is still my default PDF reader as I am rather puzzled as to why it works normally now and then, I keep an eye on it, I have so far managed to work on the files I needed to alter during those moments when the PDF remain open until I close them...