REGEDIT Keyboard Shortcuts

Searching:
"Ctrl+F" -- Opens the Find dialog box.
"F3" -- Repeats the last search.

Browsing:
"Keypad +" -- Expands the selected branch.
"Keypad -" -- Collapses the selected branch.
"Keypad *" -- Expands all the selected branch's sub keys.
"Up Arrow" -- Selects the previous key.
"Down Arrow" -- Selects the next key.
"Left Arrow" -- Collapses the selected branch if it's not collapsed; otherwise, selects the parent key.
"Right Arrow" -- Expands the selected branch if it's not already expanded; otherwise, selects the key's first sub key.
"Home" -- Selects My Computer.
"End" -- Selects the last key that's visible in the key pane.
"Page Up" -- Moves up one page in the key pane.
"Page Down" -- Moves down one page in the key pane.
"Tab" -- Moves between the key and value panes.
"F6" -- Moves between the key and value panes.

Others:
"Delete" -- Deletes the select branch or value.
"F1" -- Opens Regedit's Help.
"F2" -- Renames the selected key or value.
"F5" -- Refreshes the key and value panes.
"F10" -- Opens Regedit's menu bar.
"Shift+F10" -- Opens the shortcut menu for the selected key or value.
"Alt+F4" -- Closes Regedit
source
Hack2007