To help locate the error message which indicates why Flash is not installing it would be best to review your installation logs. The installation log files can be found at the following locations: Windows 32-bit (XP, Vista, 7): \Program Files\Common Files\Adobe\Installers\ Windows 64-bit (XP, Vista, 7): \Program Files (x86)\Common Files\Adobe\Installers\ The log filename includes the product name and install date (CS4) or just the product name (CS3), followed by “.log.gz.” The extension .gz indicates a compressed format. To decompress the file you will want to use a utility such as Winzip to allow you to view the file. Once the file is decompressed you can then open it in Wordpad and search for the following to try to determine the error message: Return value 3 ERROR FATAL You can then search for the specific error message on Adobe.com to find the solution to your difficulties.
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