Start up very slow and sometimes not at all and other weird stuff

Installed Leopard right after its release...had a mail issue which was resolved using phone support. My Macbook seemed to be a bit slower functioning and yesterday I couldn't get into it half the time - it would either get stuck in the screen between starting up and the desktop or would show the apple logo and then a 'no' symbol (like u see with no smoking signs minus the cigarette!) I did manage to persevere and get in and search a few things but the whole time everything was very slow. I downloaded the update for Leopard but its still quite slow and today I have had problems with various random programs being shut down for no apparent reason....any advice or help would be appreciated. Thanks in advance.
Helena.

Hello helena:
I am assuming you installed OS X 10.5 by using the easy install (update).
If the problems have been with you from the beginning, I think I would consider and archive and install:
http://docs.info.apple.com/article.html?artnum=107120
Barry

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