Problem with Installing Trial of Flash CS5.5

I'm trying to install the trial version of Flash CS5.5.  I have downloaded it with the Adobe Downloader without problems.  However, when I try to install the program, it gives me an error.  I am able to select the "trial" radio button and can accept the user agreement.  When it tries to install, it gives me the following error message: "The Setup encountered an error(-1) during install. Please restart the machine and try again."  I have restarted and tried to install the software several times without success. 

Thanks in advance for any suggestions.