Will do so, get back to you soon.
By the way I wanted to edit my previous post to add something, but the forums are being DDoSed it seems:
EDIT: theog multi-booting (dual in this case) will not pose a problem for me, as I can sort out and configure grub2 fine (it's between Ubuntu and Windows 7, not Windows XP and 7 by the way). The problem is the MBR issue with Windows 7.
For that problem, both of you recommended the same tutorial (System Repair), but unfortunately I was not able to fix it.
Thanks so far, not sure what else I can do. Data is the least because I keep that in the data hard drive, it's just an annoyiance to reinstall 7 because of all the software.