Second Life

Oy, first of all, Second Life does not seem to work properly on my computer--really slowed it down and the graphics are awful. When I "landed" in my Second Life everyone was naked. My son had just walked into the room and I am sure he now wonders what I am really doing in school.
I have read various articles about Second Life, but I couldn't go any further with it because it locked up my computer; frozen, naked avatars, that's my experience of Second Life.