I have QBASIC 7.1 on my Thinkpad,(pentium 75) which is running PC-DOS 2K. Never really use it though- mostly for old games, if I do fire it up.
I've never been fond of the "white on blue" look, so I always change the colour schemes of EDIT and QBASIC, and- any program that displays in the same manner- to a black background and bright coloured elements in the foreground.