Will there be any free antivirus software available to prevent virus n spywarez for pda? Sorry for my ignorant, as I have never own a pda before, but have intention to get one very soon. p750 will very likely be my choice.

I'm very curious though, what will happen to the pda, when it's infected by virus? what might be the worst case scenario? I would assume virus only attack the software, or does it also attack the hardware, causing malfunction to certain part of the pda? Please advice. Thank you very much in advance.