Try in a administrative Commandline on a client with this problems:
net stop wuauserv
rd /s /q %windir%\SoftwareDistribution
net start wuauserv
wuauclt /detectnow
wuauclt /reportnow
Wait 10 Minutes, the client want to download and install FlashPlayer again?
net stop wuauserv
rd /s /q %windir%\SoftwareDistribution
net start wuauserv
wuauclt /detectnow
wuauclt /reportnow
Wait 10 Minutes, the client want to download and install FlashPlayer again?