It is not possible to have all three on 1 machine, Linux is a clone of Unix, the arch is a little more modern in Linux but achieves a similar objective in usability. The big Unix vendors still tend to have better smp code which is why Solaris can run 64 processor E10ks. Users and admins will find they are very similar and tend to follow the POSIX standard (a portable standard for application interface).
Linux is just a kind of Unix. Except for Solaris, Unixes are expensive products mostly put out by computer companies. For example, IBM produces AIX and several other varieties of Unix, of which AIX is the cheapest. However, they will only run on PowerPC-based systems, whereas Linux will run on over 30 different hardware chipsets. If you have a Pentium, then Linux and Solaris are the only two viable choices (also FreeBSD, but that is very close to Linux).
Basically, if u want Unix and Windows on 1 machine, all u need to do is buy Linux software and partition ur drive and install Linux - so u can use both Linux and Windows. Hope that helped.