strange dos window with kb(random number.exe

hi

few days ago, i started to get strange ms-dos windows popup while surffing using explorer 7 (windows xp sp3).
i attached picture with sample of this ms-dos window and every time it is deffrent number after the KB.

now...i am using nod32 and i searched with adaware and with anti trojan and i have found few , but the problem still there its like..every hour or so +- when i am opening new tab or new internet page, this dos window apear and when i am closing the window i am getting the "would you like to end this program"? (windows xp normal messege) and after i am closing it everything is working fine..no crashes from this strange window, but still it maked me mad.

http://img15.imageshack.us/img15/6124/48765001.jpg