Er, try this site;
http://www.getboinged.org/amiga_classic.asp?pid=13&cid=108Or have a look at the links on this site...
If you pop down to the library, i`m sure that they will have a few Amiga books that will help...
As for viruses , i wouldn`t worry about it too much.
There are a few other virus checkers available.
(BTW, XFDMaster lives mostly as libraries in the Libs: drawer. Other programs can access those libraries as well, er, like DLL files)