Won't let me visit certain websites

[salilsundresh]

I haven't had any web browsing problems with my powermac g5 running os x 10.3.9 until about a month ago. I haven't been able to visit certain sites, that have in the past been able to visit. It isn't the site, or the internet connection, because these sites work just fine on a Pentium 400mhz running win 98 using Mozilla. I have tried firefox, mozilla, internet explorer, and safari on my powermac g5 with out any sucess of getting these sites to work. I have even tried reseting safari several times. Any suggestions?
Here are some of the sites that don't work for me:
www.piracysitesarenotappreciatedhere.com

I didn't mean to spam using that other site. I wasn't trying to get more referals it was just that was one of the sites that didn't work for me.

[mad jew]

The site works for me. Do you have any Parental Controls implemented (only relevant if you're not an Administrator account) in the Account System Preferences? Have you tried disconnecting from your network and then reconnecting? Do your proxy settings match those on the PC? :)