Default gps-maus under win2005(mda2) says nothing - under 03 its ok

when opening any gps-programm (tomtom 5.21 or gpsmaus) and selecting the com2 nothing happens...
gpsmaus doesnt get signals and tomtom hangs

if i use the gps-settings from magneto and take the mapped port in the programms,nothing happens too - besides,that tomtom doesnt hang
no signals/no mouse gets known

can anyone help me ?

the mouse is a haicom hi-204s on an mda2@1.60c wwe