... Why make things so complicated?
1) unplug old drive (better safe than sorry)
2) Plug in new drive
3) Install Win7
4) plug in old drive (use boot select to boot from new drive)
5) Move all files you want to save somewhere safe (cloud, flash drive, new drive, or clearly marked folder on the old drive)
6) Reformat the old drive (or delete everything except for your 'save' folder if you do not have enough space to store your documents elsewhere)
7) Move files back to the old drive in whatever organizational form that suits your fancy
8) Rt click on 'my documents/music/pictures/etc', select 'properties' and then 'move' and select the new location on the old drive so that when you save items to these folders they will automatically be reidrected to the old drive. This is especially helpful if your new drive is a smaller SSD and space is of concern.
9) set up a skydrive acct, and install the local application. When installing be sure to set the skydrive folder to the old drive, move your important documents to it, and you have an automatic backup. Do this on your other computers as well and you will get an automatic sync of your documents between computers
Very handy for those of us to live on multiple machines. I also did this with my desktop for a quick and easy 'cheater' way of document xfers between computers. Just save to the desktop, and by the time I walk to the other machine the document is already on it's desktop.