Try Try Try...and you find the solution!
I put another OEM 10 gig drive in the box, and it loaded to the MS Dash without error. I figured this drive either had the missing/corrupt files, or my other drive had corrupt data on the E: partition that was related to teh dashboard (First i wiped the E drive and it yielded no results...as I had figured)
I then noticed, that on this modded OEM 10 gig drive from another older box, there was also a folder called "c:xboxdashdata.17f14d00"
After copying the contents of this folder to the drive that was not working, the MS Dashboard now loads!

My question:
The "xboxdashdata.17f14d00" is different from the one on the slayer's 2.5 CD called "xboxdashdata.1012a700". Also the xboxdash.xbe files are different sizes, mine is 1.8mb while slayer's is 1.5mb (original OEM drive was like 1.3mb)
Can anyone explain the differences? WHich is best to use, etc..?