Sorry i meant to type
i reinstall FireFox and go to install Flash again and the "2" is gone and the old black install window pops up and everything works normally.
Don't understand your Firefox problem as you described it with repeated installing - sounds like a portable installer version. With regards to the rest of you comments:
The get2.adobe.com/flashplayer/ and get.adobe.com/flashplayer/ are not significant the first one is an alias to the second one. Adobe flash has this bizzare (read F**ked up) installer that upon completion will delete itself. This is absolutely something that NO OTHER INSTALLER DOES and in this case where an error is encountered it is absolutely the WRONG WRONG WRONG thing to do. This is a stub installer that goes and gets the real installer. Why does it exist ? Probably to make it easy to add extra stuff on your PC such as "McAfee Security Scan Plus". Quite similar to CNET Download.com which I do not trust any longer for similar behavior. You are correct in that the message "connection error" you get a "retry" button so 2 tries then the installer gives up exits and deletes itself. Just make a copy of that file - it's only 1- 2MB and keep it in a folder and then make a copy the installer before each run. That will save you going to get.adobe.com/flashplayer/ every time to get the same installer. Once the problem is fixed you get rid of that installer file.
We recently updated the online installer, which is why you're seeing the new light-grey installer window instead of the old black window.
What Service Pack version do you have installed on your XP system?