Thanks for the inputs, guys.
Uninstalled NAv, ran Ad-aware and found 7 'Data Miners', ran AOL's own 'Spyware Protection' - nothing. Reinstalled NAv, live update, full scan in safe mode - all ok.
Strangely, during this snag, AOL Broadband checker would not run either. Uninstalled that too, but haven't bothered to install that yet since all appears ok. Only Richard's on line scan to go, but all seems well. A mystery!!
Interestingly, NAv has given me a year from now for free!! Every cloud has a silver lining!
Thank you Richard, Irish Steve and stickyb.
Cheers,
mcdhu