IPhone 3G Won't Back Up In iTunes Since Upgrading From XP to Windows 7

I currently own an iPhone 3G which has worked perfectly and synchronized with iTunes for the past 18 months. I recently upgraded my OS on my PC from Windows XP to Windows 7. Obviously i had to wipe the hard drives and re install everything. Since then my iPhone will not back up with iTunes. iTunes recognises my phone and says it is up to date but when it goes to 'Back Up iPhone' it just seems to freeze after about 10 minutes and nothing happens apart from iTunes freezing too.
It came up with a message the first time i plugged it in after the upgrade which said 'This iPhone is already Synched with a different library' it then asked me if i wanted to synch it with the new library or merge them. I opted to synch it with the new library and ever since then it has never once worked in over 3 months.
Can anyone help please ??

I had sync issues with my iphone and itunes on Win7. Seemed to last for ever, I ended up buying a new sync cable and all my problems seemed to go away.
The other thing you can try is to launch itunes as administrator if that does work try launching itunes in XP compatibility mode. Both of those worked for me off and on as I struggled with this issue until I bought the new cable.

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gck55
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