It sounds like you had what I had a lil' while ago.
When you click on the word in red - it usually takes you to the same website (I think, though I can't really remember ??). It's always an advert of some description - VERY annoying to say the least.
Open up control panel and (depending on what version of Windows you've got) open up the section where you can delete installed programmes .... it might be called "add/remove programmes" or "programmes and features" or something similar.
Have a look at all the installed programmes and look for something you're not familiar with.
I somehow managed to install a programme on my laptop - I can't quite remember what it was called but it was something like "click to shop" or something along them lines. Anyway when I uninstalled it, everything was fine, so it sounds like you've done the same as me. Somehow a programme has sneaked its way on to your computer ....... your mission, should you choose to accept it ...... is to seek it out and destroy it :P
Good luck :)