gf's dad got a imac and needs to run a program that as far as i can tell wont run on a mac, also its an intel based mac

he only uses the program every once in a while, but there isnt any other program that he can use instead that will run on a mac, his customers use it so it isnt his choice

so whats the easiest solution?
i found bootcamp will be coming out soon, and parallels is out and sounds like it would work

he isnt computer literate at all so the simpler the better, but i can do the install for him and am decent enough with pcs just not familiar with macs

im sure there is a simple solution, but all the mac shit scares me, so advice?