If you have a 4gig card you don't need to worry about the hex editor and all of that. The instructions I sent were how to put the 4 gig image onto a 2 gig card so you don't need to worry about that.
Download this tool
http://sourceforge.net/projects/win32diskimager/
this is a decent disk imager for windows and works fairly straightforward.
Click the folder and navigate to where the .img file is and make sure you have the right drive selected before you write to it.