License codes on 3rd Party Software disappearing

I installed three, third party Windows programs and entered the license codes. They all worked fine for awhile (a month or so). Now, they all come up as unlicensed with trial versions expired. When I enter the license codes, I get the message that the license code has already been used. The third party vendor says they register the copies of their software by attaching the license to the computer motherboard. How do I handle that? I can't get more license codes every month.

Help will be greatly appreciated!