well, not really..
the files are compressed by installshield, and i believe only IS can extract the files
maybe you can give us the error message you receive?
most of the time when you install something using IS, it will create a directory
C:\Program Files\InstallShield Installation Information\{some-weird-number-and-letter-called-GUID}
one thing you can try is remove (or just rename to be safe) the directory which your game created (to find out which one is which, try running setup.exe inside the directory)
after that, re-run the installer setup file ....
btw, the directory above is a hidden directory, so make sure you show all file (windows explorer > tool > option > view hidden files)
good luck
-980-