Currently Being ModeratedDec 7, 2012 3:59 PM (in response to Sara_101)
Sorry to hear that it's wanting to be a little brat for you
While I do not know the exact reason, here's the basic troubleshooting guide for it.
Hope it helps.
Currently Being ModeratedDec 7, 2012 4:00 PM (in response to Sara_101)
The most common issue is that you have to run the installer and iTunes as Administrator
right-click on the iTunes installer and "Run as Administrator"
once installed run iTunes as Administrator
post back if this has not worked.