help me before i attack my computer with an axe

[dontusewindows]

I have just thrown my windows right out the window and bought a mac its great but there are many things i ahve to get used of here after useing windows for 8 years.

I am useing OS10.3 I have been told there are no viruses on a mac is this true? sounds like it is not to me is there any where I can down load trail versions of this anti virus stuff for a mac?

Regarding lime wire I am trying to get my hands on ph*** **p etc but each time it seems the files i get are corrupt, why is this?

Also I have made a folder when setting up lime wire for my downloads to go on to but can never find any do they just dissapare?

Regarding itunes I have pasteda music folder on my desk top from my windows its about one gig I want to put this music in to i tunes how do I do this?
If anyone canhelp me out there I will be very impressed.
Thank you.