Hello
thanks for doing that forum..
...ok...
i want to sing pop / rnb and need equipement,
This line-by-line quoting thing just encourages you to be facetious so I'm going to stop myself there and get onto your questions...
1) what's the best microphone under 100$
That's a very difficult question for several reasons. Firstly, $100 isn't a lot when it comes to buying recording gear - even when trying to do things on the cheap you can end up spending hundreds or thousands on gear. Secondly, there isn't a 'best' microphone [in a specific price range]. Personal preferences aside, different mics suit different voices, rooms, even mixes (mics are often chosen for the characteristics that will most suit that track's position in the mix).
Finding a mic you like can be a long trial-and-error process; buying mics, testing them, selling on the ones you don't like, etc. I'm not too hot on sub-$100 mics so I'll let someone else post some recommendations, but its much better to try a mic out and make your own judgments rather than just take one person's opinion of one.
2) do i will need pop filter
If you get a condenser mic, especially a large diaphragm one, then yes.
3) do i will need Mbox ?? & why ?
I'll assume you're getting slightly confused with terminology here and you mean to say an 'audio interface'. Mbox is a range of audio interfaces sold by digidesign for use with Pro Tools LE.
So, do you need an audio interface? The answer is probably yes.
To get the signal from a mic to the computer you first need a mic preamp to amplify the signal from the mic, an AD converter to convert the signal to digital, then some way of feeding that digital signal into the computer.
An interface is a combination of all these (though some of the really really cheap ones lack mic preamps) wrapped up in a nice box that usually connects to your computer via USB or firewire. It is by no means the only way to get audio in and out of a computer, but its the easiest way to get started. Basically, don't go thinking that you can just plug the mic straight into your laptop's 'mic input'
4) what's the best software to record under Windows Vista system ( laptop )
Vista rings alarm bells. However, for fear of making this reply much much longer I'll skimp over that for now.
So, you have a lot of choice when it comes to picking a DAW. To name a few; Sonar, Cubase and Pro Tools are popular choices for Windows users.
However these are quite expensive and probably offer a lot of features you don't need, so I would recommend looking at something like Reaper...
http://www.reaper.fm
5) how the studios clearify the voice of singer (

coz the voice in the songs is not really the same like the original singer voice)
How do you bake a good cake?