I'm not sure if this is the same issue I had but...
It says you can opt out.
I'm not sure how it started on my pc though.
I also found it funny when one last text-enhance ad popped up on the
captcha to opt out.
... I didn't follow this bit though.
"Our opt-out service is cookie based. This means that if you clear your cookies (or use software to "speed up your computer", which clears cookies for you), then Text-Enhance links will show up again. To prevent this from happening, you will need to add the domain: textsrv.com to your softwares exclusion list for cookie removal. "
that is their permanent solution.