THeres an easier way. GO into regedit, create the key, then choose to export the key. It will save it as a .reg for you and clicking will add the key.
Also it starts with REGEDIT4 at least in Windows 98 it does. If you want the tree you mentioned to match mine it would appear like this:
REGEDIT4
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]
"Anchor Underline"="yes"
"Cache_Update_Frequency"="Once_Per_Session"
"Display Inline Images"="yes"
"Do404Search"=hex:01,00,00,00
"Local Page"="C:\\WINDOWS\\SYSTEM\\blank.htm"
"Save_Session_History_On_Exit"="no"
"Show_FullURL"="no"
"Show_StatusBar"="yes"
"Show_ToolBar"="yes"
"Show_URLinStatusBar"="yes"
"Show_URLToolBar"="yes"
"Start Page"="http://forums.techguy.org/"
"Use_DlgBox_Colors"="yes"
"Search Page"="http://www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch"
"Show_ChannelBand"="no"
"FullScreen"="no"
"Window_Placement"=hex:2c,00,00,00,02,00,00,00,03,00,00,00,b8,0b,00,00,b8,0 b,\
00,00,ff,ff,ff,ff,ff,ff,ff,ff,00,00,00,00,00,00,00,00,20,03,00,00,32,02,00, \
00
"Default_Page_URL"="http://desktop.presario.net/scripts/redirectors/presario/deskredir.dll?c=2c00&s=consumer&LC=0409"
"SmallBitmap"="c:\\Program Files\\Internet Explorer\\Compaq logos\\static22.bmp"
"BigBitmap"="c:\\Program Files\\Internet Explorer\\Compaq logos\\static38.bmp"
"ChannelsURL"="http://www.iechannelguide.com/guide/en/en_us.asp"
"ChannelsFirstURL"="res://ie4tour.dll/channels.htm"
"Check_Associations"="no"
"LastCheckedHi"=dword:01c25f3d
"Use FormSuggest"="no"
"Print_Background"="yes"
"NoJITSetup"=dword:00000000
"NotifyDownloadComplete"="yes"
"Error Dlg Displayed On Every Error"="no"
"Default_Search_URL"="http://www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch"
"Error Dlg Details Pane Open"="yes"
"HistoryViewType"=hex:00,00
"Expand Alt Text"="no"
"Move System Caret"="no"
"NoUpdateCheck"=dword:00000000
"NscSingleExpand"=dword:00000001
"Disable Script Debugger"="yes"
"Page_Transitions"=dword:00000001
"AllowWindowReuse"=dword:00000000
"Friendly http errors"="yes"
"ShowGoButton"="yes"
"SmoothScroll"=dword:00000001
"Play_Animations"="yes"
"Play_Background_Sounds"="yes"
"Display Inline Videos"="yes"
"Show image placeholders"=dword:00000000
"FormSuggest Passwords"="no"
"FormSuggest PW Ask"="no"
"AddToFavoritesExpanded"=dword:00000000
"HistoryTopNSitesView"=dword:00000014
"NoWebJITSetup"=dword:00000000
"Enable Browser Extensions"="yes"
"Force Offscreen Composition"=dword:00000000
"Enable AutoImageResize"="yes"
"Enable_MyPics_Hoverbar"="yes"
"AutoSearch"=dword:00000004
"Save Directory"="C:\\WINDOWS\\Desktop\\"
"Window Title"="Microsoft Internet Explorer"
"Search Bar"="http://jump.altavista.com/start/ie4"
"Use Custom Search URL"=dword:00000001
__________________
-Brendan