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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.

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