I`m wondering about this as well.
I have two applications turning up in Event Viewer regularly:
The first has been appearing for quite some time and seems to be related to the Google Toolbar (I have it on both IE8 and Firefox.) There are complaints about it screwing up some people`s systems on the web, but it seems to be doing mine no harm except making the Event Viewer log look a bit untidy.
The second appeared after I installed Picasa and I think is connected to Google`s little "jokes" ...those topical items that appear from time to time in the Google logo.
They are always in the form of information rather than warnings or errors, though I have the same event descriptions as you, about being unable to find the registry items or missing .dlls
I don`t think they are anything to worry about. When there is an update, it seems to be registered anyway and nothing untoward seems to happen when there isn`t one.
Irritating not to know for sure, though.