I have a desk top with windows vista sp2, 32-bit.
I logged in computer under administrator user account.
I updated flash player about 6 weeks ago but was having crash issues.
I did install when in the Firefox browser.
I finally took the time to try and fix this issue.
I tried and tried to install the latest flash player but always encountered this error during installation,
" A required file ( C:\Windows\system32\Macromed\Flash\flashplayer.xpt5 ) could not be written due to insufficient permissions."
I changed browser to IE and the download and installation was successful.
I am now going back to my default browser and see if this fixed my issue.
I will be back to reply if this was a successful fix in the Firefox browser as well.