So you reinstalled Mint, and by default unless told to NOT do this it installs grub if it sees another OS. You didn't want grub. You got it now.
You could get rid of it. I don't know how. Fred probably does.
But I'm guessing you'd be just as happy if it just "disappeared" and never popped up. Thats something I know how to do, but seeing as I'm at work on an XP box I can't give specific exact step-by-step instructions at the moment. So I'll simply ask:
Would it be "good enough" if grub had a zero-second delay, booted instantly and automatically to Mint, and never showed its menu for more than a split-second? But at the same time, you could still interrupt grub if you absolutely had to boot "safe mode"?
Also, wouldn't it be much easier to boot Windows from grub than by playing with your BIOS?