I have a fix for the "No supported languages found. Please contact Bioware" error during installation.
I first tried to do a manual install that was possible with ME1 (extracting the .rar files manually, etc.), but had issues with flickering GUI and a crash after the intro sequence.
This is for Win7, but should also work for Vista and XP (but the path for step 3 may be different)
Heres is what i did to get a proper install:
1. Copy all files from DVD1 and DVD2 to a folder on your computer. (I actually just copied DVD1 first and waited for it to ask for DVD2 in the install, till i copied the rest)
2. Run Setup.exe, the error will show up again.. don't close the window yet!
3. Go to C:\\Users\\yourUser\\AppData\\Local\\Temp\\MassEffect2Temp. There should be a file named Install.exe
4. Copy the Install.exe file to your setup folder from step 1
5. Run install.exe and it should start the setup.