If Word and Adobe Reader are what's being used to view their respective formats then (of course) they are what the ActiveX plugin has to load to view those formats. If they are already loaded and running then the plugin doesn't have to load them as they are already there.
If you want to speed things up you can use something else to view the formats.
For Word your choices are probably limited to using the Opus MultiView plugin instead (which will hook into a 3rd party viewer, which you have to acquire separately, which can show Word documents without loading Word itself), or upgrading to Microsoft Office 2007 (which will allow the ActiveX plugin to use the new Preview Handlers which come with Office 2007 and enable programs to view Office documents very quickly, without loading the full Office apps to do so).
For PDF there are several alternative PDF readers such as FoxIt and PDF-XChange and I think one or two others. So long as they are installed after (or instead of) Adobe Reader you should find the ActiveX plugin uses them instead of Adobe Reader.
FWIW I find recent versions of Adobe Reader aren't too slow at loading. If you're using quite an old version then updating it may be enough.
[quote]It appears that Foxit has to be open before DOpus will view Adobe or Word files quickly.
Another viewing problem occurs when I delete a file. If I delete a Word file that I am viewing, the viewer will NOT automatically open the view of another file, any other file, until I either open a file in Foxit or Word or close and re-start Opus. Does anyone know how to resolve this?[/quote]
That doesn't make any sense. What does FoxIt have to do with Word files? As far as I know FoxIt only handles PDF.
What happens when you click on another file after deleting one?