XP will not install some programs

Not sure why, but certian programs won't install on one of my units (they load fine on two others (same OS) -- not weird software at all --

Have had a problem with IOMEGA backup program / A highschool yearbook program we are using at our school --- other programs (like Acrobat/ Office etc all installed without a problem) -- but these simply won't respond. No error message - double click on set up file .... nothing.
Have also tried copying the program disk onto desktop but that didn't help ---
any ideas anyone?
thanks and Happy New Year.
 
Are you using different firewalls or security/antispyware software on the troubled system, than are installed on the good systems?
 
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