I think maybe the OP referred to the Context Menu opening.  The menu
that pops out when you right-click any file anywhere.

Some systems will have to gather all the possibilities available for
that particular extension.  For example, I have quite a few methods
available to me for JPG files.  It takes about 15 seconds for that type
of file, but, for an EXE it only takes about 1 or 2 seconds.

GP

--->

The lines highlighted (in pink, if I recall correctly) are the
non-Microsoft shell extensions. The idea is to disable (not remove) one
non-Microsoft shell extension in turn until you hit upon the one that is
causing a problem. (I am presuming that someone has told you that your
problem is caused by a shell extension.)

You need to be very careful when you work with this tool. Work slowly,
one item at a time. A good place to start is shell extensions that
appear to belong to software you uninstalled from your system.

It's always better to disable shell extensions from the interface of the
program that created them (e.g., compression programs, media players)
rather than using the ShellEx tool.

---
Leonard Grey
Errare humanum est

Did you read the instructions outlined in the article I posted earlier?

Run ShellExView and once it's completed its search, click on the Type column
twice.
Look in the list for those items listed as Context Menu types. That's the ones
you should be concerned about, not the entire list.
One at a time, right click the Context Menu items highlighted in pink and
disable them. Check to see if you still have the slow right click behavior. If
you do, go back and enable that item. Continue this process for the remainder of
the non-Microsoft context menu items.

Good luck

Nepatsfan