urgent!! please need any help that is left

I can't install the software for my Audigy2 oem anymore. It seems that i can install the driver software but when i try to install the media source software the installation stops at 62 percent and then says that it has finished. After rebooting, an error message apears at the start up that says that   "An installation support file could not be installed". Also all software programms that need the media source doesn't work anymore, including eax console, media source go, soundspeaker settings, surround mixer etc... When i try to start one of this programs for example media source player, an error message apears: "failed executable ctcms.exe Version 1.1.4.5. failed module ntdll.dll. Vesion 5.1.2600.2180 Failure adress 0x00001010"

I can uninstall the audigy driver software but i cannot uninstall the media source software, it allwasy says this An installation support file could not be installed.

But sound is working.

This happend before,i tried to install the new retail drivers from creative, after a week of trouble how to install them i finally got them working, but then suddenly i got a system error with black restart screen, later i investigated that this error is connected to a bad driver incompabilty with the audio card. So i tried to uninstall the new drivers and take the oem cd drivers and here i am.

This were some of the steps i allready tried(in combination of course): many times installing uninstalling with following methodes using driver cleaner3, delating files and directorys manually that remained, using the uninstallation exe from the cd "ctzapxx", cleansweap without changing the pci slot. I also tried to install the single packages from the cd to the hard drive but still media source refuses to install fully. Now will try to make  a cleansweap uninstallation with changing the pci slot but i don't think it will work because for a pure cleansweap i also have to uninstall the media source from the add remove options. bzzzzz

The last chance would be a new clean WinXP installation i hope, but this should be really the last chance, please help, me it's really urgent( and i know that it was my own mistake)

PS.: the oem is definitly diferent to the retail, no chance to use retail software without difficultys or even system errors