I would move the data from your last two partitions (M + S) onto your current C: partition. Then delete M + S, and resize C: to as small as the Disk Management will let you. This will take some time to achieve, so be patient. Then you should be left with only System Reserved, and C:. Then create a simple partition upto the max size allowable, and transfer all your personal data from C to this new partition. Make a note of the new total size of the C partition, then its a simple case of booting into Windows setup, and formatting your C partition (identify it by its total size), and then installing 64bit to that. Once in Windows, move all your personal data back, and delete the partition you made to move all your data into.. Or keep it, and use a separate Data partition. Either way will work just fine.
Here's a side note: I remember a while back, I accidentally booted up and started installing 64bit Vista as opposed to 32bit on my friends Acer desktop which had a OEM license sticker on it. I was not aware I mixed up the DVDs and booted up from the 64bit version. I proceeded with the installation, booted into Vista and was able to use his Vista Home Premium OEM key to activate the 64bit version of Vista. He originally had the 32bit version installed, I remember checking it right before I started the installation process in the "System" control panel.
Yes, you shrink the C: Partition. You have about 400 GB of free space available, so you should be able to shrink it by about that much. Once you have done that, create a new partition, move everything you want to save to your new partition, and install Windows 64-bit on the original C: Partition. Afterwards, simply take all the saved data, still on your new partition, and transfer it over to your new Windows installation.
Wow, Leeky, I applaud your efforts. Athem doesnt seem to technically inclined, so I would highly suggest he just burns his data to some CDs and just to a full reformat. Hopefully your computer has a CD burner, most likely it has a DVD burner, which would be easier because you can fit more on it. Otherwise, why dont you just go out and buy a large flash drive? 32GB flash drives are getting cheaper nowadays, also so are external hard drives. Keep it simple, really simple. EDIT: Have we found out the reason why Athem wants to move over to a 64-bit OS?
I'm pretty sure windows doesnt have a resize option, correct me if I am wrong. You will have to boot up to a live cd of some sort. Gparted will work for this.
Windows 7 does have a resize option. Its in the Administrative functions menu. Hit start, and in the search bar type disk management and enter to bring it up. You can also find it through the Administrative tools menu in Control Panel.
