DBpedia Spotlight runs on the Java Virtual Machine, so it should run on Win7 if it has some implementation of the JVM installed. http://www.java.com/en/download/testjava.jsp
If you do have Java, you can just run the service from the jar.
See the quickstart instructions: https://github.com/dbpedia-spotlight/dbpedia-spotlight#run-your-own-server
Or: https://github.com/dbpedia-spotlight/dbpedia-spotlight/wiki/Run-from-a-JAR
People have reported success under Windows: https://github.com/dbpedia-spotlight/dbpedia-spotlight/issues/121