Hi
SimCity install includes the VC++ installation package it needs. Default location is C:\Program Files (x86)\Origin Games\SimCity\__Installer\vc\vc2008sp1MFCUpdate\redist Quickest thing to try would be to go to the install folder, right-click the vcredist_x86.exe file and choose to "Run As Administrator". Let it run through the installer, then try SimCity again.
If that doesn't work, try installing this Visual C++ package:http://www.microsoft.com/en-us/download/details.aspx?id=40784 You can install both (vcredist_x64.exe and vcredist_x86.exe) if your operating system is 64-bit or just vcredist_x86.exe if your operating system is 32-bit.
I would suggest doing an uninstall of Origin and SimCity first, then install the packages, then reinstall Origin and SimCity - run all installs "As Administrator" and set your icons to always run Origin and SimCity "As Administrator".
Let us know how it goes - Happy Building!