I would highly recommend going to Norbie's site, registering there & explaining what's happened. Also run the test program he asks you to just to be sure there's still no worms, spyware, etc. on your system. See NorbiesWorld (click on link) as he is an expert in sorting this type of issue out.

There is a chance your friend didn't downld the files. I'm wondering whether these files have been called upon by a spyware/worm to secretly downlded without your knowledge. There's been similar cases to this! So please tell Norbie what's happened & run the Hijackthis test he asks you to.