I can't install iTunes on Windows 7. "An error occurred during installation of assembly"

I recently purchased an iPhone 4s. This product requires me to insall iTunes on my pc, which runs Windows 7 64bit. However, when installing iTunes I keep recieving the same error message-- An error occurred during the installation of assembly 'Microsoft.VC80.CRT,type="win32",version='8.0.50727.4053',publicKey Token="1fc8b3b9a1e18e3b". ProcessorArchitecture="amd64"      HRESULT: 0x800736B3
I've already looked over many previous forum posts and haven't been able to find a suitable solution to this yet. I had iTunes on my computer previously but deleted it after I had freezing trouble. I have ensured that all old files have been removed. Bonjour gave me some trouble but I think I have dealt with that now. Also, I have been experiencing some failures with windows update-- service pack 1 for windows seven and some security updates mostly-- which I am yet to solve. I really have no idea what to do as I would like to run my iPhone on the latest iOS. If anybody could help me I would be forever grateful.
Thanks, heattr.

I've been having the same issues for the past year and a half. I've spent 6-8months trying to figure it out. Went to various Itunes stores with pictures on my Iphone per each step so I could relay all information that I'd come across and the personnel were less than helpful, after conversations that would sometimes last an hour between myself, employees and managers they always came back to "simply uninstall then reinstall" when I told them for the thousanth time that I've done that multiple times and my errors are happening while trying to reinstall it they act stumped and say "well then I'm not sure, I'll give you a call if I figure it out" and disappear. I've been very disatisfied at the lack of support from Apple and if Android to piece together a reletively reliable phone I'd switch to them in a heartbeat. I'll follow this question incase someone can answer this, but I don't have much faith.
BTW, wifey has Windows 7 running on the laptop and my phone syncs just fine to that and no trouble with itunes, just mine (desktop).

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