Hi Tidy
 
I cannot answer all of your questions but I can furnish you with a couple of answers. 
You asked: 
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				Before I download any file to my computer can I download the file to a disk so I can scan it for viruses, trojans, worms, spyware?
			
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  Answer:  You can set Limewire so that it downloads to an external drive, when I used to use LW this is how I used it.  Once on the external drive you can run your AV, AS and any other protective app you have on your downloaded file. 
You also asked: 
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				How does Limewire protect me from downloading adult content to my computer?
			
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  Answer 2: There is a feature within LW that allows you to enter keywords that you want excluded from your search results. 
You may also find the LW userguide useful, just click on this URL:   
User Guide - LimeWire  
UK Bob