dual boot -WINNT and RedHat

I have the RedHat 6.0 installed in my Compaq Prosginia 300 and now I wish to install WINNT for it.

please help me regrading
1)How can I found out whether my system have enought hadisk to install WINNT or not?

2)How can make the dual boot -LINUX and WINNT.
Please gives some comments and help

my email address:hoayfern.lee@duraco.com.sg

thanks