Firstly thanks for replies and apols. for mistake, it was McAfee not Norton: paused Avast and used McAfee's free scan. And for lack of information, so...
have W2000 pro, updates ok, location :
c:\Documents and Settings\Administrator\My Documents\install.htm (HTML Document 395 bytes)
Trend did not pick it up either.
McAfee removal via

'engine and DAT files' not feasible for this novice, any simple removal instructions valued!