Fausto,
>I have installed Visual SourceSafe on a new server, and I need a way to import all the information stored from the actual installation (projects, source code files, histories).
Are you saying you have an existing installation and have now installed VSS on another machine?
>How should I face this? (I am using VSS 5.0). As far as I know the "data" and "users" folders are the most important ones to restore.
You can copy the entire Data directory from one installation to another, or in fact, just copy the entire VSS folder if they are the same versions of VSS (but I assume you have upgraded from 5 to 6, and do not want to just copy the entire installation).
Check out this MS Knowledgebase article: Q176909
http://support.microsoft.com/support/kb/articles/Q176/9/09.ASPIt explains how to move the Data folder, or just projects if you wish...
Let me know if you have any other questions! Once moved, clients should be able to access the new database jus by pointing to the new installation...
Joe Kaufman