Built in virus scanner
 

I'm sure this is hard to do but I bet it could help alot being virus's do spread with people who don't know what their doing, nothing that it won't help 100% but it can help it some ways or just add a feature where people if they download a file it can be flagged good or bad.

I have asked that all ready all you have to do is download a virus scaner from download.com AVG Free is a good one.

ive always thought the same thing but i always hear ppl complaining that limewire has the most virus's yet ive never had one