Try the latest version of KIES here: Samsung Kies -
---------- Post added at 11:03 AM ---------- Previous post was at 10:54 AM ----------
As for nandroid backup, follow these steps:
1. Download clockwordmod recovery from here: *koush.tandtgaming.com/recoveries/recovery-clockwork-2.5.0.4-galaxys.zip
2. Rename it to "update.zip" and put it on your internal SD card.. Don't put it inside any folder.
3. Open the battery cover, then go to settings -> privacy -> factory reset. Reset your phone.
4. The phone will reboot, wipe all caches and then it will reboot again. After it wipes cache and reboots again, don't let the phone boot up, remove battery.
5. Put the battery back in, then boot into recovery mode by pressing Volume UP + Home + Power button simultaneously.
6. When in recovery, use volume keys to navigate to "Apply update.zip". Press home button. Your phone will now boot into clockworkmod recovery.
7. Use the volume keys to navigate to nandroid. Use the back soft button to select. Then chose backup, and backup your ROM.
8. It will take a few minutes to backup, then phone will reboot.
9. You will now be able to see a clockworkmod folder in your internal sdcard. Please zip this folder and upload it somewhere.
10. I will be eternally grateful if you do this for me
If you have any questions, feel free to ask! This is totally safe and it will help you too once you decide to mod your phone