Following on from my earlier post "False Positives" it seem clear that having now read a number of posts on the forum that there is a problem with the latest incarnation of NS/NIS.
I only "upgraded" on my desktop (manually via check for newer version) because the latest version had automatically installed on my laptop via Liveupdate. I was blissfully unaware of the problems............I was also not aware of the Norton Security/Norton Internet Security situation........that'll teach me not to jump in with both feet in future!
Full system scans on my relatively new laptop (2 months old) have not produced the deluge of apparently "high risk" files that have been "uncovered" on my desktop.
Now I am aware of the version 22.5.0.124 over-sensitivity I was wondering if a re-installation the earlier version I have from the original DVD would be successful whilst we wait for Symantec to sort out their "heuristic engine".