Not silver? That sounds like you have bought a dodgey copy to me. Though it should be a purpley colour. I will have to see if I can get a look at the readable side of the SIMs disc while I am out shopping tomorrow.

I don't know what the policy is for the manufacturers of the SIMs but you may be able to get a replacement copy if you have the reciept from where you bought it and are awilling to contact them and make a report. MS does this on a case by case basis where the person has unwittingly bought pirated software. Though if you if you bought it in a flea market/Sunday market/car boot you may not get any help at all.