once it finishes, it should be installed. It wont auto-start.
2 ways to check.
- Take the DVD out and put it back in. Instead of the first button being clickable, the second and third should. It only does that once installed correctly. (one runs it, and one uninstalls - I dont know which)
- Check the Start menu for All Programs->07th_Expansion->うみねこのなく頃にEP2->Umineko2 - if that icon exists, its installed correctly. You can click on that to run it
Once thats confirmed, just install the english translation patch and you should be ready to go....