Instructions:
http://www.androidtotal.com/root-samsung-captivate-on-android-2.3.3-gingerbread-kf1-firmware/
32bit Drivers:
http://drivers.softpedia.com/progDownload/Samsung-Galaxy-S-USB-Driver-for-Windows-x86-Download-96692.html
64bit Drivers:
http://drivers.softpedia.com/progDownload/Samsung-Galaxy-S-USB-Driver-for-Windows-x64-Download-96693.html