Itunes 10.2 wont open in my windows 64-bit

hi guys,
i've been trying to open my itunes 10.2 on my toshiba a665-s6089 windows 7 64-bit, but nothing works. from my past experience, i already used itunes 10.1 and it worked pretty well, but after i updated my itunes to 10.2, it won't work. Moreover, i uninstalled my itunes 10.2 and changed it again to 10.1 and still, it wont open! I've tried to stop bonjour service, but doesn't work. please help. thanks!

many thanks.
Some questions aimed at narrowing in on possible culprits with error-message-free iTunes launch failures.
(1) Does your QuickTime Player launch, or do you get an error message of some kind when you try to launch that?
(2) If your QuickTime seems to be launching fine, try (by way of experiment) disabling the BonJour Service.
In your Start Menu, right-click Computer and select "Manage".
Expand "Services & Applications".
Open "Services". (Maximise the window to better see what's going on.)
Right-click the BonJour Service and select "Properties". In the "General" tab, set Start-up type to "Disabled".
Restart the PC, and try launching iTunes again. Does it launch this time?
If iTunes launches with the BonJour Service disabled, by any chance do you have a recent version of IOBit's Advanced SystemCare utility currently installed on the PC? If so, try uninstalling and reinstalling Advanced SystemCare. Can you launch iTunes without having to disable the BonJour Service now?

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