Well, first... greetings. Now, to business:
As Pierre told you
M$ won't allow a non M$ boot setup to run - it overwrites it, with its own.
You will need to use the Linux boot manager to get access to both O/Ss.
That, that right there, more than tells you the rest of the story. However, if you insist:
I learn[ed] that Ubuntu allows it to happen [...] Mint is somewhat Ubuntu in the core, so[,] cant it allow so?[...]
Well, yea its Ubuntu based, but still, that does not mean that they have to perform exactly the same functions. I mean, Mint is Ubuntu based, yet Ubuntu is Debian based, however, that does not imply that Mint would work the same as Ubuntu, or as Debian. But the important thing here is: What is it that Ubuntu allows to happen? That's a bit confusing there. Here's the way I see it:
Say you have Windows7 installed (Which I dislike just as much as Vista, BTW), and you install Ubuntu. When you install Ubuntu, it will install a boot-loader (GRUB or LILO), this boot-loader will in turn allow you to boot into Ubuntu, or Windows7, your choice. If that is the case, then yes, Ubuntu is able to do "it." Where "it" is all that I just mentioned in Case 1.
Say you have Windows7, and opt to install Ubuntu. Say too that from Windows you are able to... somehow... setup your Windows7's boot-loader so that it displays both OS's as options to boot into. The fact that Ubuntu would be compatible to do such thing does not mean that Ubuntu is able to do "it." Where "it" implies Ubuntu's compatibility, or ability to be booted from within a Windows7 boot-loader. What happens here that Windows7 can do "it" as long as Ubuntu is compatible with this process. (Can you see how I'm getting a headache from writing this?
However, you further persist (and no, I am not complaining, I'm simply analyzing what you're saying to get to my point
I actually am talking about loading grub using the windows boot manager
So, your plan is to "load" a boot-loader (GRUB) from within another boot-loader (Windows7's)?
Sort of like... nesting boot-loaders?
That would be redundant, and unnecessary.
Then you go on explaining this quite complex algorithm to your problem:
I found out that Ubuntu can be easily booted from windows boot manager by first making the GRUB installed in the ext3 partition where Ubuntu is installed and then adding the GRUB link thr[ough] the software called easybcd.... i tried it on mint but it didn't work.
That was more confusing than reading a Chinese book upside down. However, I think I was able to crack this codified language. What you are saying is that you can boot Ubuntu FROM Windows7's boot-loader by taking GRUB into a Partition where Ubuntu is installed, and somehow set a link from the Windows7's boot-loader to that Ubuntu partition where the GRUB is installed.
OK, I get that, but... why go through all this...
After I install (Linux's GRUB), my windows 7 bootloader will be taken over by Linux's GRUB bootloader. Now I don't want that to happen. I wish to use Windows 7's bootloader to give me options on whether to boot into linux mint 7 or windows 7
... trouble, for lack of a better word, when you can simply install GRUB as your main boot-loader?
The fact that your Windows7's boot-loader will be over-ridden does not imply that Windows7 will act any less imperfectly (yea, I meant that "imperfect"
). Not only that, but it would save you time, and it's very effective. Now, I don't know all that quantum-nuclear-rocket... science you did to Ubuntu so that it could be booted from a Windows7's boot-loader, but, let me tell you... there is no need for that.
Use the tools that Linux is providing you with, they do have a tendency to be more stable, secure, reliable, and fast. Install GRUB as your main boot-loader, and avoid all this hassle.