Someone may know of a program that actively monitors registry changes, keeping a log, but I've been very happy with Elcomsoft's Advanced Registry Tracer. It allows you to create backups of your registry, which it compares. The results are made quite clear...it displays two columns (one for the previous and one for the current) that list every difference that exists. The results are then lined up so that if an extry used to exits, it's displayed in the left column, and there is a blank space in the right. If an entry has been modified, it will display the old value in the left column, and line it up with the new value in the right column. It costs $40, but there's a free trial (I think it was 2 weeks) so you can determine if it's worth it.
Hope this helps,
is there a way or an app that finds new registry entries. say,,,after i get off the internet and i want to see if there've been any changes to it.