http://snowleopard.wikidot.com/
Logging in via web browser with crashes may mean you are using a browser that hasn't been tested with it, or a software that hasn't been tested with it. Look at the above listing, or the listing below for Snow Leopard compatibility:
http://www.macintouch.com/specialreports/snowleopard/slcompat.html
If you have any peripherals attached, make sure those are compatible too:
http://support.apple.com/kb/HT3669
If your friend is having issues, I suggest they post here another topic thread to isolate their problem if the above advice is insufficient.
Message was edited by: a brody