What is your operating system, version & edition?
What is your web browser?
How are you reinstalling Flash Player; what is the name of the installer?
[topic moved to Flash Player forum]
Windows OS - Windows Vista Home Premium
Browser - Internet Explorer 8
Installing through Adobe.com downloads site using Adobe Flash Player Installer
Do you have the 32-bit or 64-bit edition of Windows 7?
Do you have Service Pack 1 installed?
Try to download and run the offline installer for Flash Player