Hello all, I have this Dell Win XP OEM, I installed it to a HP PC. Now my problem, I got hundreds of PC given away. When I tried to install the OEM to this HP PC (first time I used the cd), it needs the activation. Will it be okay if it is any serial from those hundreds of PC? because I only got one left with me and I hope it works. Or it should match to that specific colored label on the machine when it was pack? Thanks.