21. Explorer navigation
The Windows 7 version of Explorer has partly disconnected its two panes, so if you're double-clicking your way down a complex set of folders in the right-hand pane, the left hand tree won't always expand to follow you.
This may improve performance a little, but it also means that you won't always be able to see the complete folder structure unless you expand it manually, which on balance seems a bad idea. If you agree then click Organize > Folder and Search Options, check "Automatically expand to current folder", and click OK to restore normal operations.
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