Well, I don't know if this has been reported before, but I found out the reason I was having the validation error code: 0x8004fe21 is because I installed the Intel drivers (INVM110CD.exe) on my Lenovo Thinkpad X61T tablet PC. The installation modified a ton of files which showed up as "tampered with" when I run MGADiag. I am still puzzled why this would happen since the drivers had MS approval???