You might want to tell everyone upfont
That zip file contains a RootKit

( not just imply it. ) I know, everyone should know better, and it is zipped so it shouldn't create a problem unless they open it and run it, but you know how that goes ... someone will infect their system!

Trend Micro identifies it as BKDR_HACDEF.GEN

Spyrus's suggestion about PsKill should kill the process ( I don't have a box to infect to find out ) but there may be other files that spawned it still there lurking. Try Trend's solution at the link above, and if that doesn't work ... there's always mmkhan's solution.