I understand that there are a lot of similar questions on the forum about this issue. However, I can't find a possible solution for my problem. Every time I start my laptop, it keeps giving me 4 options:
1) Try Ubuntu without installing.
2) Install Ubuntu.
3) OEM install (for manufacturers)
4) Check disc for defects.
I don't understand why it keeps giving me the first two options because I have tried to select and install Ubuntu more than just one. I don't understand what are the option 3 and 4 about so I don't want to make thing worse. And I cant find any option that allows me to switch to windows 7.