Well, what OS is your computer? (Sounds like Windows??). And what webserver are you running? What folder on your HDD is the Document Root? Where is the "bundle" relative to that DR? And where do you intend to put the new one?
Could you get a response in your browser at http://localhost/ before you installed the PHP bundle? Incidentally, is your system able to resolve the address for localhost accurately? How? (Correct config is important). (If windows, it should already know the address.)
Are you sure the webserver was running last time your tried to access http://localhost? Are you running a firewall? Can you port scan your own machine?
Just a few ??, 😉