Thanks to someone named sabooher, they showed me how to get into download mode on the vibrant, so if you are having trouble, hopefully this works for you.
Follow directions exactly.
1)start off with phone turned off
2)press down volume up, and volume down at same time, and never let go until you get into download mode. DON'T touch the power button
3) while holding down both volume buttons get your usb cable which is connected to your computer
4)plug in the usb cable into your phone, while you still hold down both up/down volume buttons at same time. Don't touch the power button.
5)As soon as you plug your usb cable into your phone, the phone will instantly go into Download mode.
6)You may now release the volume buttons
7)To exit download mode, I just do a battery pull, but of course you never want to do this if you are actually downloading something, you will brick the phone possibly if you do a battery pull during an actual download. You can also try holding down the power button till you exit out, this may work also.