1. download the zip, unzip it into some folder, let's say C:\Applications\apache-maven-3.0.3
2. setting up variables
M2_HOME=C:\Applications\apache-maven-3.0.3
put %M2_HOME% into PATH
M2_REPO=C:\Users\Paul\.m2\repository
3. mvn -v should work now.
4. to make sure a project maven compatible, use mvn eclipse:eclipse
5. in Eclipse, you need setup M2_REPO variable
select Window > Preferences. Select the Java > Build Path > Classpath Variables page.