When installing Visual Studio 2013 on Windows 8.1 you might encounter some problems during the process, one of them stating that the digital signature of some components could not be verified.I did the following steps to fix the problem and afterwards successfully installed Visual Studio:
- Update Windows 8.1
- Try the methods from 1 to 6 stated in the following page: http://support.microsoft.com/kb/822798
- Download Visual Studio as a web installer e.g. Visual Studio Ultimate: http://go.microsoft.com/?linkid=9832436&clcid=0x409
- Run Visual Studio setup from the location that was stated in the Web Installer. By default: C:\Users\(Your username)\Documents\Microsoft Visual Studio Ultimate 2013\
This procedure worked for me!