"iTunes has a invalid signature" when updating to 11.1

I was trying to have iTunes updated to version 11.1 but It failed to download first before install, then I clicked download only and the message popped up saying "iTunes has a invalid signature". Why I keep getting this? and How can I fix it?
I'm running Windows 7 64-bit.

Hello mms math 8,
Thank you for using Apple Support Communities.
For more information, take a look at:
iOS devices: Keeping device within acceptable operating temperatures
http://support.apple.com/kb/ht2101
Use iTunes to restore your iOS device to factory settings
http://support.apple.com/kb/ht1414
Use iTunes to back up your device and transfer and sync any additional content to your computer.
iPhone and iPod touch: Charging the battery
http://support.apple.com/kb/ht1476
About battery life and the battery
Battery life and number of charge cycles vary by use and settings. Find more information about batteries foriPhone and iPod.
Find information on how long the battery is expected to last between charges.
Rechargeable batteries have a limited number of charge cycles and may eventually need to be replaced.
http://www.apple.com/batteries/iphone.html
Have a nice day,
Mario

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