Dell Service Tag Rename/remove utility

Hi, has anybody got a bootable cd that can either rename or delete the servicetag on a dell optiplex gx620 desktop PC?

Reason why i ask is that I purchaed this pc from a computer fair in working condition, but it seems that the tag states "*uckU" on bootup and is totally inappropriate especially when my son of 5 uses it.....

I download one but states it can only be used on a D series so doesnt work on the otiplex GX620.

I would really apreciate it if someone can send me a link or mail me directly.

cheers

 

At what point do you see this message.?
Is the screen still black or what?
What OS are you using?

 

i just got fed up and sold the pc, didnt want my son reading such filth