NAC inc - Richard ' you were the one I expected to reply!!! Many thanks , have done the scan you advised ( having also Mcafeed ) and seem to be virus free! I also thought of a worm or somesuch. Certain programmes - Olympus digital camera , HiTi photo printer , Mcafee Quick Clean and my Outlook address book have disappeared from sight but are probably lurking somewhere in the system , not being a computer wizard I can't work this out!