Can't install iTunes on my PC?

I was trying to install iTunes to my PC (windows 7 64 bit) but there's an error message. I have uninstalled all the programs which related to iTunes but I still can't install iTunes. Anyone knows how to fix it?
Thanks

Added (1). I need iTunes to restore my iPhone. Cannot install iTunes on my PC

Either you downloaded a 32 bit version by mistake, or you need to run the install by right clicking on the installer and "Run as Administrator"

You mention… Uninstalling all related programs to iTunes… And then say… Why can I not install iTunes…

  • Why can't iTunes download and install iOS 7? I can't update to iOS 7 with just my iPhone. I need Wi-Fi. So I've tired downloading and installing 5 times already in iTunes. Each time it tells me it's gonna take 25-26 hours. But when it gets to 21 hours left, a small page would appear saying "An unknown error has occurred (9006)." It's getting me frustrated. Is there something I'm doing wrong while updating to iOS 7?
  • ITunes on Apps tab Says Install on Some Apps? I have a couple apps on my iTunes that say Install instead of the usual Remove. I've noted that these apps are the apps that I've had and then deleted, but not all of my deleted apps are on there. How do I remove these apps from my iPhone's iTunes? On iTunes 11, right click --> delete does not show up. On iTunes 11, going to the library and manually deleting them doesn't work either.
  • Install Application on Iphone 4 without Itunes account? My friend and I both have an Iphone 4. I have an Apple ID and a Itunes account. My friend does not. How can I install a payment required application from Itunes t on my friends Iphone?
  • I want to install some Apps on my iPhone 4 that require iOS updates I can't get. What can I do? I can't update past 7.1.2 but when I try to install it says it needs the latest iOS. Shouldn't there be an older version of the app I can use or something? How can I get to them? specific example; stumbleupon