You have to download it.
Here...
Samsung_USB_Driver_for_Moblie_Phones_v1_4_6_0
Put it in the root of C:/
I'm getting frustrated... I can't get past waiting for device and I've tried everything I could in this thread. I've reinstalled the drivers several times. Followed all instructions. But it still says that it can't find the drivers when I try to update android 1.0. Any suggestions? And I'm using 32 bit Xp and this computers a POS, if that helps. I'm starting to think I may just need to find a computer that doesn't suck, since I've had a lot of problems just to get here.