Same issue. Got the drivers from Samsung and all is well. Go into bootloader and I get 1.0 and it won't update. Installing the drivers again
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Don't keep installing the drivers. It doesn't help. That was my mistake as well.
In the device manager, go to the Android 1.0 with the yellow exclamation point and right-click to update driver.
Click on the bottom box where it say to select driver from device list. (Sorry. I don't have this in front of me right now.) You should be able to scroll down and see a Samsung device listed.
Click on that and it should show 1 or 2 listings for "Samsung ADB Device" (or something like that).
Install one of those and you should be all set.
In my experience, my Android 1.0 issue kept coming back. My trick is to get your bootloader to where you were before saying "waiting for device" and THEN install the driver.
As soon as you install it, the unlock option will show on your phone.
I spent over 3 hours last night going through the motions with Google searches, installing PDA manager again, downloaing the updates and reinstalling drivers.
Once I figured this out, my wife's phone took about 15 seconds to do.
Good luck!