Download and create a local project on local computer from Visual Source Safe 2005

You can separate a project from source control by fetching it from Sourcesafe, opening it up, and then "Unbinding" it from source control:

http://msdn.microsoft.com/en-us/library/ms181375(v=vs.100).aspx

Since you already have the files, just open them up when you're not connected to the network - it will fail to contact the SourceSafe server and allow you to work offline. From there, if you unbind the solution from source control, it will remove all the information about source control mappings from the solution and project files for you.

If you'd prefer to do it by hand, you can just open those files in a text editor and remove the sections related to source control yourself, but it's easier to let VS do it for you with "Unbind".

The article is for TFS which is a newer  server - client source control. I am using VisualSourceSafe and w/o a plug-in for Visual Source Safe (cant get that for other administrative reasons) in VS 2010.