Set "Computer" folder to its original view style in Windows 7
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In the Registry Editor (regedit) backup/export the following key first:
HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell -
Delete the following key:
HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU Restart
Note: This will reset all your folder customizations.
It looks like you've hidden the navigation pane. To make it re-appear, try:
"Organize" -> "Layout" -> "Navigation Pane"
You've set the view to "Medium icons".
To fix:
Right click, View, Tiles