CindersC 0 Newbie Poster

Hi,
My mac's new - so I'm pretty sure it's OSX. I'm having probems because I try to use for example Naxos and downloadable sheet music sites and I can't listen to the audio/view the pages. So it gives me a page to go to in order to install the plug-ins. I've downloaded windows player for mac, sibelius scorch and installed them, but they're nowhere to be seen(not in my applications) and I still can't do anything! Please help me!:sad: