This is a little bit imberresing...
I'm running dual boot Win7 (on SSD) and BT4 R1 (on HDD). Problem is I don't know how to set GRUB.
I fix'ed problem by entering BIOS and switching priorities on storage media (HDD & SSD), however, I hope we all agree, this isn't the best solution.
I did play with menu.lst, but, unfortunately, unsuccessful.
Thank you in advance.