had same problem, run a program called HiJack this. it is much better than Ad-Aware or Spybot. It is very quick and when you see the results of the search, just check everything that looks like shit and delete it.
Probably the program you got is something like free scratch ticket or some other gambling program that someone clicked yes on. Other thing you could do is go to excludes in spybot and check the boxes with c2.lop. Spybot will then run the whole program.
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