Loaded w/ possible malware - what to do?

I was helping my father with some things on his macbook (running Leopard) and noticed that in his downloads folder there were over 200 .exe files, with a handful of other strange .dmg and .pkg files in there as well (all named things like "movie" and so on.) I asked him what they were and where he'd downloaded them from, and he responded, "I don't know. I've never downloaded anything ever!"
Obviously he has. I'm not sure if he's opened any/tried to run them or not (couldn't get a solid answer.) I've never had to deal with security issues such as this on a Mac before, so I'm at a loss as to how to fix the situation. I've got two questions, basically:
1. How can I remove all the bad stuff and make sure that it's been removed thoroughly?
2. Is there anything I can do to prevent stuff like that from getting downloaded in the future? I've tried explaining that one shouldn't download files at random or click on links in spam emails, etc. but he seems to think that everything is legit, or it wouldn't be on the internet. Is there any sort of program or anything that will block this stuff?
I'm really at a loss here. I considered taking it to Genius Bar and hoping they can sort it, but the nearest one is over an hour away, so I'd prefer not to do that unless I have to. I'd be super grateful for any help anyone can offer. Thank you!

Hello g:
Welcome to Apple discussions.
.exe files will not execute on a Mac - just delete them.
Some of the .pkg and .dmg files may be legit. One would have to look at them to see what they contain.
Is there anything I can do to prevent stuff like that from getting downloaded in the future? I've tried explaining that one shouldn't download files at random or click on links in spam emails, etc. but he seems to think that everything is legit, or it wouldn't be on the internet. Is there any sort of program or anything that will block this stuff?
I'm not being critical or flippant, but you cannot protect people from their own actions. A powerful learning experience would be to have someone download something that clobbers the computer.
Impress on him that random downloads can cause trouble - even on a Mac.
FWIW, there are NO documented viruses that affect a Mac running OS X - none.
Barry

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Loaded w/ possible malware - what to do?

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