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Split it / delete the unwanted segments...

Maybe something in the following
tutorial will work for you:

"Splitting A Clip In MM2.1"

Drag the video/audio clip to the
Timeline.

Play the video/audio by clicking the
"Play" button under the view screen.

You will see the Playback Indicator
(vertical line) advancing across the
timeline.

Click the "Pause" button at the point
where you wish to trim and type...
Ctrl+L or click the "Split" button at the
bottom of the view screen.
(you can also make adjustments by
dragging the Playback Indicator)

Make as many splits as you want and
remove the unwanted clips by right
click / delete.

And...Movie Maker 2.1 only displays every
other frame. In order to see all frames, the
following info from PapaJohn may be useful:

===

Movie Maker 2 shows you every-other-frame
when doing project editing. MM1 and Movie
Maker in Vista show you each frame.

It's usually not a problem when skipping over
the in-between frames, but sometimes you
notice a flickering frame in a clip that is a 'stray',
and you can't see or cut it out.

If you apply the Slow - Down - Half video effect
to a clip in the timeline, you are then seeing
each frame rather than every other one. You
can see the problem frame and split it out.
Then remove the effect from the clip to return
it to normal.