Help what is it

Hi can some help me as i dont know what hit me:-  here is soem background 

1) I thought i had an email from my brother - there was a link in it. Being really stupid I clicked it and then wham !!

2) Next thing all may contacts in my address got an email from me with a link and some times a nonsensical sentence 

(here is an example - Crabbe and Goyle caught some this time Goyle hopped furiously on the spot trying to rub it out)

I KNOW STUPID

In the link there is a ref - word like safelinksn 

any body ever come across something like this before.  I delete all the files in panic :-(

 

any help would be most welcome