Warning message "you may be running 2 Spybots and are licenced for only one."

When I start he scan, I get this warning that I am running two Spybots and am only licenced to run it on one computer. This is the only computer on which I have installed the licensed version. I do have the freeware on another computer that I seldom use, but the two computers are not linked. What's happening? Also when I start the scan it takes 2 or 3 hours--is that normal?

Will appreciate help.

I don't see any answer here. I am having the same issue and this is my only computer. Recently purchased the antivirus. Problem seems to be since then.

So in a way it is correct as the sale did not provide for 2 but only more than I actually have so it was the easy way out and just buy 2
Paid by prepaid visa actually :-)
Will have to renew at one point for those 2 but the price is right !
So this is a quite logical reason it seems I misused 1 license to do 2 PC's

Marc