I hope I answered most of this in the other thread ....
As for viruses. Limewire will download what ever you ask it to. It will not filter viruses, and it is essential that you have up to date virus and spy ware protection on any computer connected to the internet, and even more so if you are using a p2p client like Limewire.
Purchasing pro will not lessen your ability to pick up viruses. Nor is any programme less likely to download viruses! Limewire is easier to use than Phex which is the other client I use. I also use Frostwire, but at present that is to all intents and purposes, identical to Limewire.
BTW I don't see why you don't have e-mail on your other computer. You can do as I do and use an Opera browser which combines the two. I think you would find it makes life easier