Video Mode Not Suppoerted

hI - have just updates ATI drivers for samsung syncmaster 530tft was adjusting resolution settings and set it to a res that too high or something... anyway all i get now is "video mode not supported" and i can't access the properties tab to change the resolution back to one that is supported. I have tried booting in safe mode and restoring disp. adapter to factory default but get rundll32 error...has anyone got any tips on how to sort this out cheers edi btw using win98

 

boot to c:

c:\scanreg/restore [note the forward slash]

in the menu, choose a date to restore to, before the odd settings