Give us a bit more to work with...

• what os are you running?
• what install method did you use?
• what version did you (attempt) to install?
• Have you looked in you file system to see whether the install acutally happened?

Would be glad to help, but you need to show you made some effort too! If you have not done the basic trouble shooting, you should, and then ask your question.see this -> Good questions and how to ask them