I agree with Les...Something as simple as this should do tha trick..
Code:
$key = "HKCU\Software\YourCompany\pagelaunch"
$value = "lastlaunched"
$page = "http://www.kixtart.org/ubbthreads"
$lastlaunched = ReadValue($key,$value)
If $lastlaunched <> @Date
$null = WriteValue($key,$value,@Date,REG_SZ)
$ie = ReadValue("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\IEXPLORE.EXE","")
Run $ie+" "+$page
Endif
