If you want to study unix, just install linux ,that's ok.It is also one type of unix.
要使WINDOW98与UNIX操作系统怎样装在同一台电脑里,你要设置不同的分区,我觉得你既然用PC,最好用linux,solaris的X86不太好用,SCO UNIX在这边根本没人用.
go to www.redhat.com , u can dl a free version, 4cd total.
there're serval linux distribution, it's hard to say which one is best, it's really depends on ur need.