i was just checking around system performance-config file etc. and noticed this strange file called bigdog.exe. so i checked few forum and noticed that it's a spyware first spoted or perhaps originated in china and then it was spoted in few european nation.
so personally i removed it as i hate to have any useless file on my computer. it'was under c:\windows directory ( just type bigdog.exe on search tab and you will see where it located)