Itunes crashes when starting sync

Question

i've been trying to update my ipod touch to the ios5 for the past couple hours and have been having a lot of trouble. i connect my ipod to my computer (windows vista), i select download ios5 only, accept the agreement, and then it doesn't go through the first step (backing up my ipod) because then it says "itunes has unexpectedly stopped" and doesn't offer any other choice but to close the program. i've tried logging off, shutting down, and restarting my computer. as well has check through my system folders to see if i have any unnessesary file duplicates of quicktime and i didn't see any and have also tried the data execution prevention and adding itunes (i don't know if that's what i was supposed to add???) to the list but it says i can't enable it for itunes.
Problem signature
Problem Event Name:    BEX
Application Name:    iTunes.exe
Application Version:    10.5.2.11
Application Timestamp:    4ee0844d
Fault Module Name:    StackHash_0ce6
Fault Module Version:    0.0.0.0
Fault Module Timestamp:    00000000
Exception Offset:    00000000
Exception Code:    c0000005
Exception Data:    00000008
OS Version:    6.0.6000.2.0.0.768.3
Locale ID:    1033
Additional Information 1:    0ce6
Additional Information 2:    0afa58c5fa72d0b16cb319e8e973e832
Additional Information 3:    5b43
Additional Information 4:    d8f75e7575a673295a578b40f217f84e
did i miss something? if there's anyone who can help me fix my problem or have any suggestions i'd love to hear them! please & thank you.
my ipod touch is version 4.3.5 (8L1)

Answer 1

Did you already try to remove all Apple related software and install iTunes again after that? Removing iTunes, QuickTime, and other software components for Windows Vista and 7