Issue:
Flash Player is not multi user on WIndows Terminal Server 2003 even after installing in Install Mode
Resolution:1. Download the latest Flash uninstaller on this page: http://kb.adobe.com/selfservice/viewContent.do?externalId=tn_14157&sliceId=1
save it in a temp diretory on your hard disk (for instance C:\Temp)
2. Open a command prompt, navigate to the folder where you placed the uninstaller and run it with the "/clean" option, like this: "uninstall_flash_player.exe /clean" (without quotes!)
3. Click the Details button. If it lists any files as "Delete on reboot", then reboot now. Otherwise, continue.
4. Download the EXE installation package from:
http://www.adobe.com/support/flashplayer/ts/documents/tn_19166/Install_Flash_Player_9_ActiveX.zip
5. Use the Control Panel Add/Remove programs method to install it. This ensures that the Windows install notification API triggers correctly (as opposed to executing change user /install in a command prompt).
6. Use regedit and find the following key: HKCR\CLSID\{D27CDB6E-AE6D-11cf-96B8-444553540000} (on 64-bit Windows this one is located under HKCR\Wow6432Node\CLSID\{D27CDB6E-AE6D-11cf-96B8-444553540000})
7. Remove any permissions for the Everyone group. click Advanced and tick the box to propagate the permissions to all child objects.
8. Add the Everyone group and give it "Read" permissions on the key. Again, click the Advanced button and propagate the permissions to all child objects.
9. Use regedit and find the following key: HKCR\CLSID\{D27CDB70-AE6D-11cf-96B8-444553540000}
10. Remove any permissions for the Everyone group. click Advanced and tick the box to propagate the permissions to all child objects.
11. Add the Everyone group and give it "Read" permissions on the key. Again, click the Advanced button and propagate the permissions to all child objects.