The installation of the latest Flash Player on my MacBookPro failed, what can I do?

Hello, the installation of the latest Flash Player on my MacBookPro failed (OSX 10.9.2, 2.4 GHz Intel Core 2 Duo, 4 GB 667 MHz DDR2 SDRAM). I use the latest Version of Firefox (29.0) and I have already uninstalled the older Version of the Flash Player. During the installation process, I receive the message "general installation failure" at the range of 53%. What can I do to solve this problem? Thank you!