Installing CS4 from CS5.5 32-bit package

Recently bought CS5.5 - the product insert says that a complimentary version of CS4 for the stragglers (like me - using XP Pro/SP3).  Inserted the "Content and Installation Help" disc into my cd drive, and nothing happened!  Nothing showed up on the My Computer display either - wondering if it's a hardware issue (system specs are too far out of date for the installer to launch), or if something is wrong with the software.  Same thing happened when I tried to use each of the three application discs.  Any help would be appreciated!