Someone on our team installed StyleCop and since then all of the projects he loaded up and committed to source control refuse to load unless stylecop is installed.
I know I can manually edit the .csproj files to get rid of it, but is there an easy way to automatically remove these stylecop parts from the project files so they can be loaded and built on a non-stylecop-infected Visual Studio machine?
Answer
Why remove it?
In my opinion using StyleCop is a good thing.
Your only problem seems to be that your team member didn't set up StyleCop properly.
From your description, I guess that he wanted to set up StyleCop with MSBuild integration: http://blogs.msdn.com/b/sourceanalysis/archive/2008/05/24/source-analysis-msbuild-integration.aspx
He apparently just left out the last paragraph "Team Development": copy the StyleCop files into your project and check them into source control, so you don't need to install StyleCop on every single developer machine. (see my link for a more detailed description)
If you do this, StyleCop should work on every machine, no matter if it's installed or not.
We are using StyleCop in this way as well, and I think it's the easiest way to use it.
I just had to insert two lines into each .csproj file and check a few files into source control once...and StyleCop just works, on every compile, on every machine (no matter if it's on a developer machine or the build server).