use WinRAR to unpack the rar files. Install and run Daemon Tools.
A little red icon will appear in your system tray. Right click on it. Choose Virtual CD/DVD ROM. Set number of devices>>3 (You might as well mount all the CDs at the same time. You can turn this down to a reasonable number later

).
Left click on the icon. Choose Device 0. A file requester pops up. Choose the first .iso/.cue or .nrg file that you unpacked. (not certain which format was used for this but Dameon Tools won't care.)
The FS2 installer should pop up if you've got autostart selected. If not just go to my computer and treat it like you would a normal CD Drive.
Repeat with devices 1 and 2 to insert the other CDs when you're asked for them.