Scripting

I'm assuming you mean regedit.exe not reg.exe, and do you mean export/import or load/unload?

regedt32.exe has the ability to load and unload user hives for users who are not logged on.

Below is the vbscript (function) we are trying to implement as a machine startup script using Group Policies. Any thoughts???

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Function ModUserHive()
'Loads, Changes and Unloads Default User Hive to change preferred walpaper and background color
set objshell = CreateObject("Wscript.shell")
strComputer = "."
strKeyPath1 = "Tempdefault\Control Panel\Desktop"
strKeyPath2 = "Tempdefault\Control Panel\Colors"
objshell.Exec ("%comspec% /k reg.exe load HKU\Tempdefault c:\Docume~1\Defaul~1\ntuser.dat")
Set objReg = GetObject("winmgmts:" & _
"{impersonationLevel=Impersonate}!\\" & _
strComputer & "\root\default:StdRegProv")

objReg.SetStringValue HKEY_USERS,strKeyPath1,"Wallpaper","C:\WINDOWS\Web\Wallpaper\kiosk.bmp"
objReg.SetStringValue HKEY_USERS,strKeyPath1,"OriginalWallpaper","C:\WINDOWS\Web\Wallpaper\kiosk.bmp"
objReg.SetStringValue HKEY_USERS,strKeyPath2,"Background","26 98 4"

'objshell.Exec ("%comspec% /k reg.exe unload HKU\Tempdefault")
End Function

If it is not "compulsory" to be Visual Basic, you can try this little .exe:
Load Hive
that you can find here:
http://www.matcode.com/codes.htm
(size 7 kb)

With the above and this little nifty utility:
Nircomline
that you can find here:
http://nirsoft.multiservers.com/
(size 22 kb)
You can do almost anything to a poor innocent registry hive!

jaclaz