Tarry Singh at http://www.databasejournal.com/features/oracle/article.php/3712246
writes great article how to install Oracle VM.
It gives a really detailed step by step run through the oracle vm installation with loads of pictures showing the screens you see at each stage of the install.
Don't like to read:
8 minutes and you know all about installing Oracle VM
Check out you tube http://www.youtube.com/watch?v=R_W5_5wJy80