Can't Install Flash for Firefox

I was prompted today by Firefox to install the latest version of Flash. Unfortunately, the installer says I have insufficient permissions for the file C:\Windows\SysWOW64\Macromed\Flash\NPSWF32.dll. As I understand it, that would mean I don't have administrative permissions, but I do. I am on the only account on this computer, an administrator account.
I downloaded the uninstaller to try to start fresh. It uninstalled successfully, but when I tried to install, I get the same error. Now I have no flash at all for Firefox.
I tried to use IE instead, and that worked perfectly. I can view flash content in IE now fine. Unfortunately, I guess I have to install it for Firefox separately, because I still can't view flash content in Firefox.
I am using the latest version of Firefox on Windows 7 64 bit. Does anyone have any idea what to do?

alliaphagist wrote:
NPSWF32.dll has a modified date of 7/17/2009.
That sounds quite old! Can I assume that all other files in that folder are newer?
Can you try the following:
open a Command Prompt (Start | Run | type cmd )
in the Command Prompt window type this sequence of commands
cd \
cd Windows\SysWOW64\Macromed\Flash
regsvr32 /u NPSWF32.dll
exit
(You can copy and paste, or type everything in just lowercase characters.)
Next open Windows Explorer, go to C:Windows\SysWOW64\Macromed\Flash and delete NPSWF32.dll (also install.txt, as it is probably also old).
If you cannot delete that file, what error message do you get?
P.S. there should be no web browsers running when you do all the above.
P.P.S. see next post...

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