Error when installing wpilauncher.exe

I keep getting an error when I try to run wpilauncher.exe.  Using Windows 7.  Have administrator privileges.  Is my anti virus software to blame?  I've never had this problem before downloading software.

Description:
  Stopped working

Problem signature:
  Problem Event Name:    CLR20r3
  Problem Signature 01:    webplatforminstaller.exe
  Problem Signature 02:    4.0.0.0
  Problem Signature 03:    510fa231
  Problem Signature 04:    mscorlib
  Problem Signature 05:    2.0.0.0
  Problem Signature 06:    4ca2b889
  Problem Signature 07:    1b2b
  Problem Signature 08:    c
  Problem Signature 09:    System.IO.FileNotFoundException
  OS Version:    6.1.7601.2.1.0.256.1
  Locale ID:    1033