[JandS]

Every time I click on a topic I have to close an ad down to view it....also certain words or phrases in topics are underlined and in colour, what's happened? Has something got on my computer?

[Richard Cole]

Think you have some sort of malware, you can get free download, just google malware software, download it, run it and should sort it out.

[Richard Meads]

Definitely malware. Use this, free, and it gets rid of anything that gets past your antiviral.

 https://www.malwarebytes.org/

[stuart_clark]

Are you sure you are not on CLEANTALK ? LOL

[Teddycare]

If you're using Google Chrome as a browser,You will probably find that the  program has been added as an extension.
Go into Google settings/tools/extensions, and delete the offending program, If you didn't put it there as an extension you don't want it.

[JandS]

Thanks for replies....like the last time it happened. it occurred for one day and now it's gone and everything is normal