I got Flash Player 9 fixed after trying all kinds of things in these posts..
I had the problem where I would see the quote mark " instated of the content
at the download installation page
I'm running Windows XP media edition
Here is what I did to get it working on my system.
I'm not sure if each of these steps are essential
but this is what I did that worked for me.
It's a combination of things I found in different forums.

1. I used the uninstaller at Adobe's Web site following the instructions given
here:
http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=tn_14157

2. I went to this link and installed the latest FlashPlayer version 9 from
Adobe's web site here:

http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFl
ash
I tested it and it failed to work at this point.

3. I downloaded and ran this installer "install_flash_player_active_x.msi"
save it you'll need to run it twice

http://fpdownload.macromedia.com/get/flashplayer/current/licensing/win/install_f
lash_player_active_x.msi
running this will close all browser windows so save this link or print this
out first.
when I ran this I got an error message it said something about Flash9.ocx
failed to install or register.
so I did a search for it and found it in C:\WINDOWS\system32\Macromed\flash I
copied it and pasted it to
C:\WINDOWS\system32
I tested it and it failed to work at this point.

4. I opened regedit............ click start.. click run.. type in regedit..
click OK
Then went to HKEY_CLASSES_ROOT\
and went down the list to each of the following and for each one I allowed
full control to administrator
to do this locate it, right click on it, left click permissions, make sure
administrators in highlighted,
put a check in the box under Allow for full control, choose apply then choose
OK.
I read in the forum that some of these might not be there no worries if they
are not.

.mfp
.sol
.sor
.spl
.swf

FlashFactory.FlashFactory
FlashFactory.FlashFactory.1
FlashProp.FlashProp
FlashProp.FlashProp.1
ShockwaveFlash.ShockwaveFlash
ShockwaveFlash.ShockwaveFlash.1
ShockwaveFlash.ShockwaveFlash.3
ShockwaveFlash.ShockwaveFlash.4
ShockwaveFlash.ShockwaveFlash.5
ShockwaveFlash.ShockwaveFlash.6
ShockwaveFlash.ShockwaveFlash.7
ShockwaveFlash.ShockwaveFlash.8

Then I went to
HKEY_CLASSES_ROOT\CLSID\
and did the same for these
{D27CDB6E-AE6D-11cf-96B8-444553540000}
{D27CDB6E-AE6D-11cf-96B8-444553540000}\InprocServer32

I tested it and it failed to work at this point.

5. I ran "install_flash_player_active_x.msi" again and this time it gave me an
option to Repair or Fix
a previous installation and I chose that. It ran fine with no error message.

I ran regedit again and checked to see if it changed the permissions and found
a couple of them had
changed and so I set them back again.

Then I tested it and it worked fine!!!
Now I'm happy I can play backgammon on Windows Live Messenger with my
friends...

I might add more info about the original problem.
So you can tell if it's the problem your lookin for a fix for
Whenever I installed FP9 it was as if I had not done it.
I would see the quote mark instead of the content.
the next time I would Go to a site that required it
it would just ask me to install it again
I could find it in Add Remove programs I could not un install it from there
I needed the un installer program to do so.

I spent a lot of time trying till I got it fixed I hope this helps someone

I guess I can add this in case this info helps anyone
When I first noticed the problem I was running
Windows Internet Explorer 6
I went to Microsoft's site looking for a fix and downloaded and installed
Windows Internet Explorer 7 beta hoping that would fix er up but NOT
then a few days later they came out with Windows Internet Explorer 7RC1
I tried it and that one didn't fix er up. It is the one I'm useing now.
It is the one I was useing when I got FP9 to work finnaly