Updated November 2012
Before getting into the things you need to know, a little background on my "credentials". I was the Southern California representative for this program from 1984 thru its August 1996 demise. When Steve Vorenberg had to fold up shop (couldn't get a Windows version out fast enough to compete), he kept providing support via phone on Saturdays, and via email, for another couple years. If my name is familier it's because you've seen it in the Family Roots™ Dos Version 4 manual. As a result, most people had gotten used to my providing support, so Steve turned over all the support to me and went to work programming in the private sector.
Macintosh: I can only convert the data (to PC version of FR only) if you can burn to a dos formatted CD, or drag to a flash drive. Sending via email has never worked.
Apple II: can no longer be converted (nor any other platform like Commodore etc, except PC).
PC: if you have version 3 or 4, I can still convert to 4.4d (last version), but if you are reasonably computer literate you can probably do it yourself by reading the pages suggested below.
Whatever you do, get your data put into another program as soon as possible.
The current day programs have issues with importing the old gedcom version that FR Mac makes, and only marginally better with the gedcom version that the PC makes. WhollyGenes can still do a direct import of FR PC into The Master Genealogist (data must be cleaned first, see cleanup issues).
I don't know the various Mac models and operating system, but FR won't run on the many of the new ones. The PC version will not run on a Windows 64 bit machine (minor exception being in a virtual machine which I can't help you with). It's very difficult to buy a new PC nowadays that is 32bit. I have no experience with Windows8 but I'm pretty sure that it will not run on that.
So, don't lose your hard work by procrastinating.