This is what i am using but i am getting an error when i try to write to this key. Any ideas what i am doing wrong

$R = READVALUE ("HKEY_CURRENT_USER\Control Panel\Screen Saver.Marquee","text")
? $R
$a = WRITEVALUE ("HKEY_CURRENT_USER\Control Panel\Screen Saver.Marquee","South Lanarkshire Leisure")
GET $X