Hulu needs me to upload the latest version of Flash but my Mac OS system doesn't support it.

I have 10.5.8 it asks for 10.6 and up. What should I do? If I upload the most recent version of Flash Player will it muck up other stuff? (I'm currently having problems with my email account.) Or do I just have to do without Hulu? (Bummer.)

Thanks for any assistance/advice you can give me.