Do the following:

Download the Adobe Flash Player Uninstaller, close all open programs then run it and restart your computer.

http://kb2.adobe.com/cps/141/tn_14157.html

Download Flash Player with the manual installer for the Browser you're using.
?Flash Player 10 ActiveX (Internet Explorer)
?Flash Player 10 Plugin (All other Windows browsers, such as Firefox or Google Chrome)

http://kb2.adobe.com/cps/191/tn_19166.html#main_ManualInstaller

Troubleshoot Flash Player installation | Windows
http://kb2.adobe.com/cps/191/tn_19166.html#main_DetermineVersion

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