Every browser I have Including IE 8, Firefox 3.5.3 and Google chrome 3 stopped viewing any Google adsense or any alternative ads on any website contain any of them.
I first discovered the problem when my website stopped viewing the ads I had (google adsense, Adbrite, and AdOnion) first I thought that problem is in my website then i discovered that this problem including all websites that has advertisements lik Google adsense

Have you tried downlaoding and installing the latest java system from the sun microsystems website?
Do you have anything like Peer gaurdian or nay other IP based blocking software installed?