There isn't a 256bit version of any browser, 32bit or 64bit being the current versions. I only have 32bit versions of IE, so I don't know how you would confirm if you have the 64bit version. Presumably you can elect to run the 32 or 64 bit version of IE with win7x64 version.
Do you have any Microsoft Visual C++ 20xx Redistributable versions installed, check control panel, Programs and Features, you need the 2008 version.
Side-By-Side Configuration is Incorrect Error - You need to install MS Visual C++ 2008 Redistributable.
You need 2008 SP1 - this is the one:
Microsoft Visual C++ 2008 SP1 Redistributable Package ATL Security UpdateNote this link there are 64bit versions there (IA64, x64) ensure you get the correct one for your OS (x86 32bit OS, x64 64bit OS)