People trying to play any RSPS on Windows 7 usually encounter a problem that involves the client closing shortly after you hit run.
So, Here's what you need to do.
First, Find the run file inside your client.
Right click on it and press "Edit".
You should see a notepad pop up with something like this;
What you need to do is delete everything before "-Xmx300m".
Then leave that open and go to your C Drive and find your Java.
Copy the path to your Java and then paste it in the Run before "-Xmx300m".
It should look like this once your done.
Remember the "" before and after the path.
The client should then work fine. Enjoy.