A
From time to time when i view a page on the forums, my download manager asks me if i want to download this.

And this bar pops up at the top.

Sorry, didnt know what to name the thread.
A
Might be a rogue ad thing.
B
You might have some of those vundo softwares or a rogue software, as stated by anand, in your PC...
L
don't accept it, the activex control is probably a browser hijacker of some sort.
S
Loony will report it to the ad agency. If this keep happening we will have to switch. :/