running hoster on what size laptrop & windows 7 ?

[SVENDSEN]

Hi to everybody,
I am running hoster on windows XP ( very succsesfully may i say) & i am wanting to know if hoster runs well with windows 7, also i want to put hoster to a laptop & wanting to know what size laptop will run hoster succsefullly without going over the top?.
I am currently running hoster 4.09 can i upgrade to hoster 4.20?, & does 4,20 allow me to import karaoke VCD tracks without all the hullabalu that we normally have to do with VCD's, so that they import as kma file & run straight through hoster.
Hope you understand what i am asking.
Thankyou
regards
svendsen