Why do always see this?

[srob]

I've been on PH for a while, and viewed it on all sorts of machines without any major issues. Got a new laptop for Christmas and now, pretty much three quarters of the time I try and look at PH I see the screen below:



I don't get it on any other website, only Pistonheads. It's a Windows 8 laptop with all the official gear that comes on one, plus McAfee anti-virus.

Pretty much making me give up on trying to post (have just typed out a reply to something twice and got this both times, even though I didn't when navigating to the page) - have given up trying now!

Please, keep suggestions simple as I'm more nuts and bolts than microchips!