Screen Resolution?
Suspect that your problem may be that the screen resolution on your laptop is less than that on your desktop -
Check by going to Control Panel -> Display -Settings (Oops! That's for WinXP so may be slightly different for Vista)
On my Desktop the Screen Resolution is set to 1920 X 1080 pixels; On my IBM X41 laptop it's set to 1024 X 768 pixels.
Depending on the display chipset on your laptop, you may squeeze slightly higher screen resolution, but everything on the screen will get a whole lot smaller.
But I'm afraid lower screen resolution is (generally) one of the sacrifices you make when you move from desk top to laptop ... Sorry!