Hi electro, welcome to NST.
If your system consists entirely of XP (single or multiple), you have no use for EasyBCD.
EasyBCD is an editor for the Vista BCD.
If you want to multi-boot XP, you just need to edit the XP file "x:\boot.ini" where x is your "active" XP partition, to add an extra entry.
You can use notepad or any other text editor to do it.
You can see what form it should take here in the wiki http://neosmart.net/wiki/display/EBCD/Rebuilding+Boot.ini
Your saying your old C: partition. You can only have one partition at a time with the C: label. If you installed one instance of XP on C: and put another on C:, then that means you either did a repair install of your first installation or installed over it since you said you formatted it.
During the installation, you can partition chunks of the hard drive space for partitions, but up until the release of Vista, you could not format other partitions using the installation media other then the one you are installing Windows on. So it can be quite easy for a beginner to dual-booting to accidently allocate the whole hard drive for a Windows instance rather then partitioning it out for each of the systems you plan to install.
Before you even begin to install, you should consider the desired layout of your system's partitions and thier sizes. Then when performing the first install, go ahead and create the partitions, but make sure to specify to setup the amount you wish to allocate for each partition. Choosing the default well allocate the entire remainder of free space on the disk, which is not what you want since you need to install each OS on its own partittion.
I created the Partition and set it active so it would get named C:\ and not some other drive letter. Problem is, I can't access the other C:\ partition anymore, but it still exists. I need a way to get back to that 1st partition. Both are NTFS
I use EasyBCD because one of my installs is going to be MacOSX. I already made EasyBCD compatible with XP by loading the Vista bootloader. This is basically what I'm trying to do. The guys at this forum say to use EasyBCD
Electro, If you have Vista bootloader on your active partition (you do know it's illegal if you don't own a Vista licence ?) it still won't make any difference at this stage when you have only XP systems.
When the Vista bootloader is told to select XP, it chains to XP's NTLDR, and it's still boot.ini that will select between multiple XPs. The only difference from what I said in my 1st post, is that you've got an extra step at the head of the boot chain (bootldr). The way you dual boot the 2 XPs is still by editing another line into boot.ini. You will have a 2 stage boot process with multiple XPs if you use Vista 's bootloader.
It doesn't matter that each XP calls itself C:\ (and the other x:\). In boot.ini you identify each system by its rdisk() and partition() numbers.
If you want a single boot menu, and you already have Vista's bootloader, you could look at HnS. (It's prime purpose is to hide Vista from XP, but it has the spin-off benefit that you can boot multiple XPs from its menu (yet another link in the chain, this time before even bootldr))