Oops! HTML tags don't work if I don't log in.
Let's just try that again:

"rugup"

Now there's a good word! ;-)

I think you'd be better to solve the problem, rather than just prevent the symptoms (your ground trace burning)

It sounds like you have a major earthing (grounding) problem.
Are your printer & PC supplied by power outlets on different phases?
Could one of your outlets have reversed (Hot/Neutral) polarity, or other wiring faults?

I would add that if you've got enough potential difference on your grounds to burn PCB traces, it could well be enough to be DANGEROUS!!