How to stop this annoying pop-up?

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ThreadAuthorDate (-000)
M\joe@actionline.com2014-07-07 20:52
|MStephen Partington2014-07-07 20:57
|Mjoe@actionline.com2014-07-07 22:22
MRyan Rix2014-07-08 00:38
Mjoe@actionline.com2014-07-08 01:55
Msean2014-07-08 14:15