Whilst I was away my Dad inadvertently downloaded 'Error Safe' from a pop up (he never ran the program from the desktop icon that appeared though, if that makes any difference)
I've had a look around on the net and It's classed as spyware/riskware. I uninstalled it and run Ad-Aware and the new version A-Squared and deleted all the entries they both found. I've also removed the entries in ZoneAlarms allow list. I finally ran CCleaner on 'Cleaner' and 'Issues'.
Should all of the above be enough to get rid of this sneaky prog?