ITunes 10.2.1 64bit won't backup iPhone 3GS, doesn't give option

Hey guys, I've searched pretty thoroughly and can't seem to find help.
I have an iPhone 3GS and a windows desktop with windows 7 64 bit. I have iTunes 10.2.1 64 bit.
In the past, whenever I've tried to sync up my device, it would create a backup, only until recently did I notice that iTunes is no longer backing up my iPhone while syncing.
I've seen this topic gone over a bit throughout various forums and have found no concrete fix. I've seen people refer to deleting the itunes.plist file, and I've tried to find this file but I'm not sure I'm finding the right one.
Please help! I want to update my device but I can't find a way to fix this!
PS I can back up the device on my macbook pro just fine, just not my windows desktop. If I update my device on my windows desktop, can I then restore from backup using my macbook so that everything comes back? And then sync back to my windows desktop to get all my music, etc?
Thanks

found it, must have been a corrupt preferences file located in user/appdata/apple computer/roaming/itunes
followed this article and by removing that folder and reopening itunes, it backed up just fine!
http://support.apple.com/kb/ts1717
yes!

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Products Affected
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If your iPhone, iPad, or iPod touch does not appear under Devices in iTunes after you connect it to your Mac, refer to the troubleshooting suggestions below.
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Check USB connections. iOS devices require USB 2.0 to function properly. If you are not sure if your Mac has USB 2.0 ports, refer to the computer's specifications. Disconnect other USB devices, and connect your device directly to a USB port on your Mac.
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Thank you very much!

I think my problem is fixed now.
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Your expectations are not based in reality.
Your G4 will not run iCloud. There will be no upgrade from Mobile Me to iCloud for you with that machine unless you do it manually, and only mail will work without further expenditure.

ITunes 10.2.1 64bit won't backup iPhone 3GS, doesn't give option

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