First off you will have to get winrar. You cna get this by putting winrar in google. Next download the client. Click on downloads on the homepage. Click start download now after you click the link given. It should come up with the option to save or run. You should save it on to your desktop for easy access. Double click the icon. It should look like a pile of books. Extract the file to your desktop, dont worry there are no viruses. Once extracted click the folder and scroll all the way to the bottom. You should see the application run. Double click it and the client will come up. It will take a little time for server to come up because its your first time running it. Once it is completed you should see enter and about. Click enter and put it your desired name and password. You have to change the ip so after you click enter press enter on your keyboard twice. Delete all the o's untill theyre arent anymore. Now type in Barscape.malware-site.www Now jsut press login and you should be playing.
Good luck and I hope to see you on the server. If you need any help check out my other guide and how to start off on forums.
Here is the link for winrar
http://www.rarlab.com/download.htm