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Thanks to you both.
vehelpfulguy - it wasn't another virus checker to install on the pc, but a stand alone website which listed viruses and websites which carried them. So you could just put in the name of the site you were thinking of opening and it would tell you if it was a known carrier before you opened it.
A bit of a roundabout way to see if there was a virus, but better safe than sorry!
I use AVG so will look for the way to get the ticks, also will look at the download for Firefox