Thank you guys for your quick responses, however still having a bit of trouble!
I uninstalled the updates, and restarted, however it still doesn’t seem to be playing these quicktime vids properly! There is one update that I couldn’t uninstall, wouldn’t give me the option! Don’t know whether that is the problem update!
Decided to try a system restore, but It’s only offering me 1 restore point which is after the problems started!! Not much help! Don’t seem to be able to get any early restore points!
I’m only an amateur vid editor, now I realise why you should back up regularly!!
Phil