As a novice registry cleaner user, I use the free "evaluation copy" of
Registry First Aid from www.rosecitysoftware.com . This "copy" will only
let "Safe" items it finds be deleted, and only a maximum of 11 entries
per scan, which can go quite quickly if you use the "Back" button after
each scan. When a scan starts, select "View by Safety Level" and you
will see how many "Safe" items it finds. I have used this product for
several months and have no subsequent problems after allowing it to
"clean" the "Safe" items, though I did select the "make a backup" option
during installation. I delete the "backups" no sooner than 10 days later .