Format external drive using windows pc

This ought to be simple (I think), but it is turning out not to be.  I have an early 2008 MacPro, on which I have bought and installed Mac OS Lion.  Unfortunately, when converting to iCloud, something happened and now the computer won't boot up at all.  I have located the Apple support article about Lion recovery by creating an external storage device to which I can re-download Lion and then reboot the Mac using an external stoarge device -- in my case an external hard drive on which I have succeeded in setting up a 16GB partition (only 13GB required, per the article) using my Windows 7 PC.  It all seemed pretty straightforward until I got to the point where I needed to set the partition scheme to GUID Partition Table and format the partition to MAC OS Extended (Journaled).  I can't believe there isn't something I can locate easily which will permit me to accomplish the foregoing and proceed with recovering my system on my Mac.  Instead, everything solution I have located online so far provides for this process to be done using Disk Utilities on a Mac -- but I can't.  I only have the PC working right now.  Does anyone know how I can get the partition formatted and proceed as directed in Apple's support article? 

You cannot on a PC because it does not have disk formatters that can set up a disk partition for a Mac unless you use third-party software like MediaFour's MacDrive. The Apple support article assumes you would do the formatting on a Mac.

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