Is performance so terrible that a resolution lower than 1280x800 actually helps?
If you absolutely require scaling options, perhaps check your BIOS settings (generally del, F2, or F10 at the initial "Dell" splash screen after powering on your laptop) for such an option.
If that doesn't work, I'll find an older or the original video driver later today, it's 3:21 am and I need to sleep now.