stealth5 nh3 problem pls help!

[debug]

I done install stealth 5 for v7 39001

The problem is that when i put in ps2 back up disk, it run but it doesnt boot up.. it just browser and it doesnt seem to boot... both ps2 cd-r's and ps2 dvd-r's it just goes to the browser which shows the icon of ps2 media/, but when i press X
on it it won't boots, it just flashes black for a second and returns to the browser.... .. . what possible problem?/