b noir - I have a similar problem and have tried your work around, several times. It seems I keep going around in a vicious circle. It has gotten to the point I am giving this one last try and if I still cant get this to work I am ditching my PC and going to the Apple store for a Mac!
Here goes - I am currently running Windows 7 Ultimate 32 bit. After downloading and installing Itunes 10.7 from Apple, I have no Mobile Device Support (itunes wouldn't update from 10.6 so I had to do a complete uninstall and then download & reinstall). After a lot of searching on line and on different Forums I found your thread and followed the instructions for a standalone AMDS install using WinRAR.
I did not have an option to remove or repair since the file wasn't on my pc to begin with so it just started to run an install. It looked like it was going to work but just as it was getting to the end an error message came up that said:
"Apple Mobile Device Support wasn't installed on your computer. The installer encountered errors before Apple Mobile Device Support could be configured. Your system has not been modified.
To try these operations at a later time, please run the installer again. Click Finish to exit."
I then went to the Itunes.exe and tried to Repair, hoping that it might replace the missing Apple Mobile Device Support file. I received an error message saying:
"Service Apple Mobile Device (Apple Mobile Device) failed to start. Verify you have sufficient priveleges to start system service" There were three choices, Abort, Retry & Ignore.
Before doing anything I went down to Start, Search, Services and opened the Apple Mobile Device. I clicked "Start" and got Error 2: The system cannot find the file specified.
At this point I went back to the previous error message, hit Abort and continued to look for answers. Mind you I had to uninstall & reinstall Itunes about 3-4 times before I figured out if I didn't uninstall iCloud I couldn't reinstall iTunes. Then I also tried something else you had suggested to someone that involved downloading Autoruns, but nothing with that did any good. The only things under Winsock were Bonjour & Windows. I looked under the Services tab & found Apple Mobile Device highlighted in Yellow and it said File Not Found.
If you have any suggestions or ideas I welcome them. This has been the most frustrating thing I have been through. Like I said, I am seriously ready to bag the whole computer & get one that already has the current version of iTunes on it.
Thanks!