Problem with Firefox 25.0.1 "Message from dll" "Can't create FileMapping"

Hi all,

I have a problem with Adobe Shockware Flash 11.9.900.152 Plugin on Mozilla Firefox 25.0.1 on Windows 7 Ultimate (x64).

Every first time I start Firefox and enter a site that required flash player, I get this message.

http://i.imgur.com/rQyXONx.png

"Message from dll"

"Can't create FileMapping"

The message only display in the first time I run Firefox after startup then enter a site that require flash player. It won't display again until I restart my computer or log out then log in my Windows account again.

I try to disable/uninstall Adobe Shockware Flash Plugin and restart then run Firefox again, the message doesn't display anymore.

But when I enable/reinstall Adobe Shockware Flash Plugin and restart then run Firefox again, the message display again.

Only Firefox got the problem, IE and Google Chrome doesn't.

Thanks in advance!!

P/S: Sorry about my English.