Everytime i try to sync my iphone 3gs it freezes up when it comes to processing some type of data

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• When did the last time you sync your iPhone to your computer? As a result, iTunes should have backed up all contacts, notes through out that syncing process.
• Try hard reset, hold power and home button at the same time until Apple logo show up then let go of buttons.
• If it's still not working, you may need to restore the phone, update to latest firmware available, in this case your phone will be wiped out BUT with the above being said, you should be able to restore from back up you have earlier.

Step 1: Find out which generation your iPhone is by looking at this link http://support.apple.com/kb/HT3939
Step 2: Download the correct generation with the most up-to-date number, the higher the number, the more up-to-date it is. Example: A 3GS iPhone, that would be the most up-to-date would be iPhone 3GS (4.2.1/8C148a). The 3GS tells it that it is the iPhone 3GS. The part I have put in bold, is the update number, the higher that number is, the more recent it is.
Step 3: Go into iTunes, with your iPhone plugged in, go to the left side of the screen, scroll down and select your iPod.
Step 4: The right side of your screen should now show the general iPhone information. Scroll down the screen on the right side until you see a button that says "Restore". Hold down the SHIFT KEY on your keyboard and click "Restore" on your screen. This will pop up a menu.
Step 5: From that menu, choose the update you just downloaded and hit OK. Your iPhone will now be restored. After a few minutes, you will be greeted with a welcome screen to re-sync your iPhone.
This is the only method that seems to work.

Sync the 3GS with itunes, ensuring you check all the options you want the sync profile to capture.
then right click on your handset in the left hand bar and select 'Backup'
when you get your i4, restore it to that backup and your data will be transferred.

Download the latest iTunes to your computer and reset the iPhone. Then re-sync it.

Reset

To reset iPhone, press and hold the Sleep/Wake button and the Home button at the same time for at least 10 seconds. During this time, a red "power off" slider may appear and the screen may go black, but do not release Sleep/Wake and Home buttons until the Apple logo appears.

If iPhone won't turn on, or the display freezes or doesn't respond

1. Press and hold the Home button for at least six seconds, until the application you were using quits.
2. If that doesn't work, turn iPhone off and turn it on again. Press and hold the Sleep/Wake button on top of iPhone for a few seconds until a red slider appears, and then slide the slider. Then press and hold the Sleep/Wake button until the Apple logo appears.
3. If that doesn't work, reset iPhone. Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears

More resets:

Try This:
1. Remove Sim Card
2. Hold in 'Home' button and 'On/Off' button together until Apple logo appears
3. Replace Sim Card
4. Hold in 'Home' button and 'On/Off' button together until normal phone screen appears.


Also, Try this:
1.) Shut down the iPhone 3G.
2.) Start up iTunes
3.) Hold down HOME button on the iPhone 3G
4.) While keeping the HOME button depressed, plug in the Sync cable
5.) A message will pop up to ask if you want to reset.
6.) Just click YES and the reset process should start.

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

Call apple--however iOS must match should have left @ old setting

Yes, i had the same problem you need to restore through itunes
regards

Zone Alarm and itunes do not play well together. ZA running will corrupt some pictures, apparently some music and does not allow the update of an ipod (touch) to occur. I have had to turn off ZA for any of the above to get either a clean install or adding (or removing) photos.