rdave13 -- I removed AVG then installed Avast and ran a scan on boot -- this found over 150 items and put them in the virus chest most were prosti-BT trojan or adware. Deleted them all then ran the avast virus cleaner from the pen drive as you recommended- nothing further found
Have now deleted avast and reinstalled AVG and the rootkit message has gone !! Whoopeeeeeee
Many thanks for your help, needless to say I am now going to uninstall AVG and put back avast as it seems to be the one that was more succesful.
DieSse - when an individual file scan completed there was the main results page and a small pop up from AVG in the bottom RH corner on my screen which is where the rootkits message was displayed. I've no idea how long it was on my system but a reinstall using an acronis back up I had made about 3 weeks ago did not get rid of it so it must have been there before, also attempts to use system restore were thwarted by them not working.
Fingers crossed all OK now
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