Habe die Lösung in englsichen Forum bekommen:
Oh, sorry. I misunderstood your question. That part of the line is a parameter for running the
Cleanup.exe file. The easiest way to run an executable (.exe) file with
extra parameters is to open a command prompt and then type the entire
line I gave earlier into the prompt.
To open a command prompt with admin privilages, click on your start menu, then in the search box at the bottom type "cmd".
There should be a program at the top of the list named "cmd.exe" with an icon that looks like a black box with "C:\\_" typed in it.
Right click on this program and select "Run as administrator".
If/when prompted by Windows to allow the program to run, agree.
Type the following line into the command prompt and hit "Enter".
For 32 bit systems "C:\\Program Files\\Common Files\\EAInstaller\\mass Effect 3\\Cleanup.exe" uninstall_game -autologging
For 64 bit systems "C:\\Program Files (x86)\\Common Files\\EAInstaller\\mass Effect 3\\Cleanup.exe" uninstall_game -autologging
Make sure you type or copy the line entirely, with the opening quotation mark before C:\\
For me when I ran this installer and then reinstalled the game via Origin (not the DVDs) it installed properly with all registry entries and is now present in my control panel.
Edit: Upon further review of the posts, it would appear the problem is the absence of the first" in yout line. it should read "C:\\, not C:\\. Sorry about that.
Also einfach
For 32 bit systems "C:\\Program Files\\Common Files\\EAInstaller\\mass Effect 3\\Cleanup.exe" uninstall_game -autologging
For 64 bit systems "C:\\Program Files (x86)\\Common Files\\EAInstaller\\mass Effect 3\\Cleanup.exe" uninstall_game -autologging
in cmd (nachdem man als Admin gestartet und c:/ gemacht hat dann kopieren: es ist wichtig, dass die " dabei sind.
Es scheint, dass diese Fehler taucht auf wenn man das SPiel von DVDs installiert und nicht herunterlädt, hoffe, alle haben das Problem jetzt beseitigt.