Sync Two Iphone On One Laptop

My girl-friend owns a 16GB 3GS running on software version 3.1.2 and I own a 32GB 3GS running software version 3.1.3. After I sync both iphone on my laptop, nothing works on the 16GB iphone. The moment I tap on any Apps, it returns to the home screen immediately. Everything works fine for my 32GB iphone. I am using only one I-tunes store account.
Can I sync 2 iphone on one computer?
Must I update from version 3.1.2 to 3.1.3?
Can I downgrade from version 3.1.3 to 3.1.2?

Can I sync 2 iphone on one computer? - Yes and No
Must I update from version 3.1.2 to 3.1.3? You should
Can I downgrade from version 3.1.3 to 3.1.2? No reverting to a previous version is not allowed...legally in the TOU rules by Apple
When I say yes and no... I mean it can be done but the steps you're using is not the best way...
Best bet is to use a different user log in for that PC and then create two iTunes accounts... you can still share apps and music via Home sharing and copy items back and forth

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