ok...i running to another problem now...really need help
i uninstall mozilla 1.2.1 and install nightly build mozilla. after i install it, i try to open up my browser, but browser doesn't show up. i restart my computer and open up my browser again but it still not coming up. so i try to uninstall nightly build but it says mozilla is running, i need to close it before i can uninstall. so finally, i uninstall night build and go back to mozilla 1.2.1 but now mozill 1.2.1 is not working. it has the same problem. i try to open up but the browser is just not showing. what should i do....
any help would be appreciate...thank in advance...

Seems like that you've got a broken profile.
Refer to the FAQ about how to remove profiles.
And using nightly builds means you must know what you are doing.

ya...i think it is really my profile problem...
i have create a new profile and delet the old one...then it is working now....
thx a lot for the help~~~:)