No, and yes. It has also reportedly wiped all of your SMS messages.

 

The word is that antivirus software sold or free in the Market is actually spyware.

 

No, you don't need it. Yes, it will slow down your phone. Android is very secure, and it would be pretty hard to get an actual virus, unless someone wrote it into an app that you install from a 3rd party (not from market). The chances of getting a virus after rooting increases, but not significantly.

 

ANDROID PHONES DO NOT NEED ANTIVIRUS APPS! My phone is proof that they hinder, not help.

 

What happened?

 

Probably wiped all his SMS messages, like I said earler.