I cannot update my iTunes with"error occurred while installing updates"

Ever since I updated my Windows Vista Laptop to Service Pack 2, iTunes has not been able to update with the a popup with "error occurred while installing updates. If the problems persist choose Tools > Download Only". And i DID have to Reinstall iTunes from scratch, so please help me. I really want to get rid of this problem thats been bothering me for 2 years

 

Thanks

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