The "error 21" solution:
After much too much brain work on this I figured it out!(and, why U had to "reformat" your C: partition, and use a backup from your original drive(reformatting is NOT necessary)).. We did learn about the 3 versions of the dash-ms.xbe.. however, this is the REAL reason it produces the "error 21" code... The dash-ms.xbe file calls to other files, called .xip .. !!!.. These .xip files are ESSENTIAL to run bill gates' dashboard... So, and here is the sketchy part for me, did my buddy, when he supposedly "backed up" my C partition to his HD simply not copy all the stuff, or, did he not bring it all back, or, did bill gates in one of his games decide to delete these essential .xip's!.. Either way, it doesn't matter, I got the files off of my buddies xbox(after realizing that NONE of em were on my xbox!, and, whala, it works perfect again!!.. The .xip files are default.xip, dvd.xip, mainmenu.xip,Memory_files.xip, et.. all get called from dash-ms.xbe... So, again, U can copy and recopy dash-ms.xbe, rename it anything U want(cuz, believe me, I did!!) and link it to your evox.ini under any name, but, without these .xip files, (put your own up a creek without a paddle analogy here!)