Thank You! So Very Much. Your wise advice solved this problem.
I'm running a Barton 2500+, on an Asus mobo that supports up to 400fsb. Though I was only Running at 166, I got this same error a few others.
CRC failed in Magic World Online\gcg\picdata.gcg
CRC failed in Magic World Online\gcg\picdata2006115a.gcg
CRC failed in Magic World Online\gcg\picdata_add.gcg
CRC failed in Magic World Online\map\205.mpk
As soon as I put the cpu to 133, and my ram to auto. The installation appears to be going smoothly, though slower of course =P. While I'm not sure I think the fact that I have 2 stick of ram manufactured by two different companies in my computer played a role in this.
Anyways the point of this being vex01 had the solution, and it worked. Trust in V! ;)