You don't need QBasic on a normal Startup disk. Files like these are useful for doing advanced work in DOS - but if you ain't going to do that - then you don't need them.
Just make a standard Windows Startup disk and see if it takes you to the A\:> prompt. If it does, then it's doing what it should and everything is fine.
Or try a Win98 Bootdisk from
www.bootdisk.com
HTH