You will need following:
odin3 v1.3 http://dl.dropbox.com/u/458252/Odin%...in3%20v1.3.exe
installed Samsung driver on your pc.
1. Turn off your phone, take battery out, press volume down while plugging your phone into pc using USB, and open odin. Make sure odin recognizes your phone on the port(if not, re-install your samsung driver or use another computer).
2. Click pit, find and select Stock-i500-VZW-pit. Click PDA, find and select Stock-i500-VZW-System.tar. Click start. Upon finish, your phone will turn off. Disconnect USB, close and reopen Odin each time. Do the rest of files(kernel and recovery) in the same way, and don't forget to use pit file everytime you flash.
3. When you finish with odin, put battery back in, don't turn your phone on, and be ready for stock recovery. You will open stock recovery manually by holding both volumes at the same time, while holding volumes press and release power button(if you're not going into recovery screen, then you're not doing it right). On blue recovery screen, select wipe data/factory reset (volume to go up and down, power button or home button to execute). It will wipe everything out and restart.