1) Disable the auto sync on your computer's iTunes ( Go to Preferences in iTunes to disable )
2) Go to your iPhone's settings -> General -> Reset -> Erase All Content and Settings
3) Your phone will now be restored to a clean iOS.
4) After the restore is completed, connect your iPhone to iTunes with the USB cable
5) iTunes will ask you whether you want to restore from backup.
Choose the newest restore point ( before you hit the update apps button), iTunes will then restore your phone back to that time point and sync the older version of the apps that are still on you computer's iTunes library.
Please note that the above steps only applied if you have NOT jailbroken your phone.
If you did, replace step 2) above with the steps below:
2) Connect your iPhone to iTunes with the USB cable.
3) Hit Restore, this will restore your iPhone to a fresh, clean iOS.
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