Flash Player Update Virus/Malware

Over the last few weeks or so I have noticed that every so often after opening a new tab in Chrome I get redirected to a site (white empty page) with a little pop up box telling me to update Flash player as seen here: http://i236.photobucket.com/albums/ff137/stevenallickuk/Web%20Problem/FPupdate1_zpsceac5e62.png . This blocks all other controls until I click the cross or ok button both of which triggers a download and takes me to a spoof of the adobe flash player page (you can tell it isn't as the address bar reads "newsoftupdate.biz" and the Adobe logo is completely wrong but I expect it would fool many at first glance as seen here: http://i236.photobucket.com/albums/ff137/stevenallickuk/Web%20Problem/FPupdate2_zpsf76dc340.png

I tried following some advice to remove it including running a full virus and malware scan and checking the programs installed for anything fishy. It seemed to go away for a week or two but today I see it happening again.

It only seems to happen when I have a number of tabs open so I wonder if a webpage is triggering it but most of the sites I visit or pretty mainstream so I doubt they would be hosting nasty viruses like this.

Any advice on stopping this issue appreciated.