The man I pulled my hair with was doing this. It started after installing update 2, but only for web projects. I repaired, uninstalled, reinstalled VS2013, but I still have the same problems.
Finishing renaming the file C: \ Windows \ Microsoft.NET \ Framework \ v4.0.30319 \ Config \ web.config to web.config1 as a backup, and I was able to download my project. Try renaming / deleting this file.
edit: it loaded the project, but when you try to debug or build, you get an error message. The copy of C: \ Windows \ Microsoft.NET \ Framework \ v4.0.30319 \ Config \ web.config from my working PC to this one has ended. Works well now.
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