Navigation pane in Windows Explore unstable

When I open Windows Explore, after about 2 seconds navigation-pane scrolls down near bottom of the navigation-pane.
Shortcut Target = C:\Windows\explorer.exe /e,C:\

Same result whether "Show all Folders" enabled or disabled.
and "SaveAs" dialog and "Browse" dialogs


Also occurs when navigating through Navigation pane with keyboard navigation keys.
I have to drag the nav-pane back up to the selected folder

EDIT: Just noticed "Organize" btn is selected in the "after" image -- not by my actions.

Thank you in advance for any help :)

Before + after images:



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SPECS
Toshiba Satellite C665
OS:= Windows 7 Home Premium (32-bit), sp1 (Build 7601) OEM
UI:=Classic Shell Start + Classic Explorer

Thank you UsernameIssues for your response, :)

There is no network. Just this "Owner-PC" laptop.

It is this laptop.
When I rebooted this laptop (just now) -- read your post -- opened WinExp and tried to manually scroll-down "real fast",
"Network" was listed but it was closed, within seconds "Network" opened to reveal this laptop "Owner-PC"

Would hiding "Network" help ?
This laptop is used to sync with android phones via Samsung "KiAir" via WiFi, on odd occasions.
But no plans for a network.

My external-USB-powered HD is NTFS format and as such, drive property "Type" is "Local Disc" and not "Removable Drive"
I wonder if this is the problem ?
If I remember rightly ... FAT32 format maximum file size is 4GB ?

I would appreciate your comments :)

Thank you

I found this customizer freeware very useful:
Windows 7 Navigation Pane Customizer: Show, Hide, Rename Items In Windows Explorer Navigation Pane | door2windows

Very intuitive and much easier than plowing through settings or the Registry

Try just removing Network and see if the symptom goes away.

Thanks MilesAhead for the link to Windows 7 Navigation Pane Customizer :)
Unfortunately it does not hide "Network" on my laptop

I am still looking for help

That is a "feature" (according to some self-proclaimed MS person).

That bug is one of the handful of annoyances that exist in W7 (IMO).

If MS had just fixed that small number of issues on W8 (and not bolted on a tablet interface) it would be selling a lot better.

Unfortunately I don't still have my W7 machine. But I seem to remember getting around this using the Doors2windows tool. It was something like checking only files and folders. Than adding Favorites so that it was positioned below them. Then I dragged the favorites down so that they appeared collapsed. But I'm just going from memory.

I don't know if there is a solution for once you start expanding the files and folders in the nav pane.