Help whats this pop up mean?

[Ashy C]

Keep getting this everytime a new web page opens, so everytime i click something this comes up;




Any ideas what it means? I've clicked everything on it but cant get it to stop popping up, i think my sister may have done it, she was last on computer

[MiniMike]

reboot?

[Puntoboy]

Your PC is going to explode.

[MiniMike]

Your PC is going to explode.

stand back when you do reboot

[essexboy]

It means get firefox.

[MiniMike]

and a really cool carbon theme im using

[H8T WP]

it means get a mac also

[MiniMike]

or not

[H8T WP]

dont knock it till u tried it .... for more than 5 mins i may add

[MiniMike]

loads of my mates have it! i think its good but i got windows... so was just biggin up the windows crew lmao